Mechanism for expanding inner cylindrical surface of bobbin case and implementation method of mechanism

Abstract

The invention discloses a mechanism for expanding the inner cylindrical surface of a bobbin case, which comprises a mounting seat, an expanding seat is connected above the mounting seat, a cavity is arranged in the expanding seat, an ejector rod is arranged in the cavity, the ejector rod is in threaded connection with the cavity, and the lower end of the ejector rod is connected with a gear positioned in the mounting seat. A first rack and a second rack which are symmetrically arranged are further arranged on the mounting base, and the first rack and the second rack are connected with the gear in a meshed mode; the invention further provides an implementation method of the mechanism for expanding the inner cylindrical surface of the bobbin case. The lifting of the ejector rod can be controlled by respectively pushing the first rack and the second rack, so that the expansion action and the loosening action of the expansion part can be completely controlled, and the problem that resetting cannot be realized during resetting by utilizing gravity and resilience force in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of expansion mechanism, and particularly relates to a mechanism for expanding the inner cylindrical surface of a shuttle shell and an implementation method thereof. BACKGROUND

[0002] At present, the mechanism for expanding the inner cylindrical surface of a product generally adopts a slope surface, that is, a moving block and a top block are matched through a slope surface to convert the horizontal movement of the moving block into the vertical movement of the top block.

[0003] However, this method has some problems in practical application, for example:

[0004] 1. When the moving block is removed, the falling of the top block relies on gravity and the rebound force of the expansion head. If the falling is affected by friction and the rebound force is not enough, the top block will not fall down, so that the expansion head will always expand the inner cylindrical surface of the product, and the product cannot be taken off;

[0005] 2. There is no self-locking force. If the air cylinder for driving the moving block is removed, the top block may fall down, so that the product cannot be expanded, thereby failing to guarantee the expansion effect on the product. In practical application, for example, if the air cylinder cannot be removed when it is installed on a rotary table mechanism, on the one hand, the installation of the air cylinder will occupy limited space and is not easy to layout, and on the other hand, the air cylinder needs to be installed at each station, thereby increasing the cost.

[0006] Therefore, the method adopted in the prior art cannot guarantee the expansion effect when the product is expanded, and the product cannot be released when it is released. SUMMARY

[0007] The present application aims to provide a mechanism for expanding the inner cylindrical surface of a shuttle shell to solve the problems in the background art. The mechanism for expanding the inner cylindrical surface of a shuttle shell has the characteristics that the expansion and release actions are completely controlled.

[0008] Another object of the present application is to provide an implementation method of the mechanism for expanding the inner cylindrical surface of a shuttle shell.

[0009] To achieve the above object, the present application provides the following technical scheme: a mechanism for expanding the inner cylindrical surface of a shuttle shell, comprising a mounting seat, an expansion seat connected to the upper portion of the mounting seat, a cavity provided in the interior of the expansion seat, a top rod provided in the interior of the cavity, the top rod being threadedly connected with the cavity, a gear connected to the lower end of the top rod and located in the interior of the mounting seat, and a first gear rack and a second gear rack symmetrically provided on the mounting seat and respectively meshingly connected with the gear.

[0010] In the present application, the mounting seat further comprises a bottom plate, a seat body connected to the upper portion of the bottom plate, and a dustproof plate connected to the two sides of the seat body.

[0011] Further in the application, the expansion seat is sequentially provided with an insertion part, a connecting part, a deformation part and an expansion part from bottom to top, and the deformation part and the expansion part are provided with slots arranged perpendicularly in a cross shape.

[0012] In order to realize the positioning of the connecting part in the circumferential direction, facilitate the locking of the expansion seat and the mounting seat through the screw, further, the connecting part is provided with a positioning slot on the circumferential side, and the mounting seat is connected with a positioning pin corresponding to the positioning slot.

[0013] Further in the application, the ejector rod is sequentially provided with a positioning part, a limiting part, a threaded part and an outer taper part from bottom to top, and the upper end of the cavity is provided with an inner taper part corresponding to the outer taper part.

[0014] In order to use the iron filings generated during the machining, further, the inside of the ejector rod is provided with a through hole.

[0015] In order to realize the limiting connection of the gear and the ejector rod, and make the ejector rod rotate with the gear, further, the limiting part is a polygonal structure, and the gear is provided with a limiting slot corresponding to the limiting part.

[0016] In order to apply tension to the right end of the second rack, avoid the vibration generated during the machining causing the ejector rod to rotate and move downward in the expansion state, further, one end of the second rack is a pushing end, and the other end of the second rack is connected with a tension spring.

[0017] Further in the application, a method for realizing the mechanism of the inner cylindrical surface of the expansion shuttle is provided, comprising the following steps:

[0018] (I) the pushing end pushes the second rack to move and drives the gear to rotate clockwise;

[0019] (II) the rotation of the gear drives the ejector rod to rotate clockwise, under the action of the threaded connection between the threaded part and the cavity, the ejector rod moves upward, so that the expansion part is expanded under the cooperation of the inner taper part and the outer taper part, and the expansion action is realized;

[0020] (III) the pushing end pushes the first rack to move and drives the gear to rotate counterclockwise;

[0021] (IV) the rotation of the gear drives the ejector rod to rotate counterclockwise, so that the ejector rod moves downward, the outer taper part of the ejector rod is separated from the inner taper part, and the expansion part is reset under the restoring force of the deformation part, and the loosening action is realized.

[0022] Compared with the prior art, the application has the following beneficial effects:

[0023] 1. The present application can realize the control of the lifting of the ejector rod by pushing the first rack and the second rack respectively, so that the expansion action and the loosening action of the expansion part are completely controllable, and the problem that the reset may not be possible when using gravity and elastic force reset in the prior art is solved.

[0024] 2. The ejector rod and the cavity are connected through threads, under the action of the threaded connection, the axial thrust of the ejector rod cannot cause the ejector rod to rotate, thereby realizing the self-locking effect, compared with the prior art, the present application does not need to be equipped with a power source at each station, not only facilitating the layout, but also reducing the cost.

[0025] 3. The inside of the ejector rod is provided with a through hole, which can be used for iron filings generated during the machining.

[0026] 4. The present application applies tension spring to the right end of the second rack to exert tension on the right end of the second rack, avoiding the vibration caused by machining in the expansion state, causing the ejector rod to rotate and move downward. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present application.

[0028] Figure 2 It is a sectional view structural schematic diagram of the present application.

[0029] Figure 3 It is an exploded structural schematic diagram of the mounting seat of the present application.

[0030] Figure 4 It is a structural schematic diagram of the expansion seat of the present application.

[0031] Figure 5 It is a sectional view structural schematic diagram of the expansion seat of the present application.

[0032] Figure 6 It is a structural schematic diagram of the ejector rod of the present application.

[0033] Figure 7 It is a sectional view structural schematic diagram of the ejector rod of the present application.

[0034] Figure 8 It is a structural schematic diagram of the gear of the present application.

[0035] Figure 9 It is a structural schematic diagram of the gear cooperating with the first rack and the second rack of the present application.

[0036] Figure 10 It is a structural schematic diagram of the present application and the air cylinder.

[0037] In the figure: 1, mounting seat; 101, bottom plate; 102, seat body; 103, dustproof plate; 104, positioning pin; 2, first rack; 3, second rack; 4, tension spring; 5, expansion seat; 51, insertion part; 52, connecting part; 53, deformation part; 54, expansion part; 55, notch; 56, positioning groove; 57, cavity; 58, inner taper part; 6, ejector rod; 61, positioning part; 62, limiting part; 63, threaded part; 64, outer taper part; 65, through hole; 7, gear; 71, limiting groove; 8, air cylinder. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] Embodiment 1

[0040] Please refer to Figures 1-10 , the present application provides the following technical solutions: an expansion mechanism for the inner cylindrical surface of a shuttle shell, comprising a mounting seat 1, the mounting seat 1 comprising a bottom plate 101, the upper side of the bottom plate 101 being connected with a seat body 102, the two sides of the seat body 102 being respectively connected with dustproof plates 103, the upper side of the seat body 102 being connected with an expansion seat 5, the expansion seat 5 being sequentially provided with an insertion part 51, a connecting part 52, a deformation part 53 and an expansion part 54 from bottom to top, wherein the insertion part 51 is used for inserting into a hole on the seat body 102 to realize the centering installation of the expansion seat 5, the connecting part 52 is locked with the seat body 102 through a screw, the deformation part 53 and the expansion part 54 are provided with notches 55 arranged in a cross shape and perpendicular to each other, the notches 55 enable the expansion part 54 to expand outward to realize the expansion of the shuttle shell, the deformation part 53 is used for deforming to provide a restoring force, the inside of the expansion seat 5 is provided with a cavity 57, the inside of the cavity 57 is provided with an ejector rod 6, the ejector rod 6 is sequentially provided with a positioning part 61, a limiting part 62, a threaded part 63 and an outer taper part 64 from bottom to top, wherein the positioning part 61 is used for inserting into a hole in the bottom plate 101 to realize the positioning of the ejector rod 6, the upper end of the cavity 57 is provided with an inner taper part 58 corresponding to the outer taper part 64, the inner taper part 58 cooperates with the outer taper part 64 to realize the outward expansion of the expansion part 54 when the ejector rod 6 is upwardly pushed to expand the shuttle shell, the threaded part 63 is used for threadedly connecting with the cavity 57, the lower end of the ejector rod 6 is connected with a gear 7 located inside the mounting seat 1, the mounting seat 1 is further provided with symmetrically arranged first and second racks 2 and 3, and the first and second racks 2 and 3 are respectively meshingly connected with the gear 7, as shown in Figure 1 , as shown in Figure 1 , the expansion part 54 is in an expanded state), the left ends of the first and second racks 2 and 3 are push ends.

[0041] By adopting the above technical solution, the present invention drives the gear 7 to rotate clockwise by pushing the second rack 3 at the pushing end (the clockwise direction here is determined by the right-hand rule, corresponding to the attached Figure 9 (As viewed from above), the rotation of gear 7 drives push rod 6 to rotate clockwise. The threaded connection between threaded portion 63 and cavity 57 drives push rod 6 upward, thereby expanding expansion portion 54 through the cooperation of inner cone 58 and outer cone 64, thereby tightening the bobbin case. The push end then pushes first rack 2 to move, driving gear 7 counterclockwise. The rotation of gear 7 drives push rod 6 counterclockwise, thereby moving push rod 6 downward. The outer cone 64 of push rod 6 separates from the inner cone 58, and the expansion portion 54 returns to its original position under the restoring force of the deformable portion 53, losing its tensioning force on the bobbin case. The present invention controls the raising and lowering of push rod 6 by separately pushing first rack 2 and second rack 3, making the expansion and release of the expansion portion 54 fully controllable. This solves the problem of the prior art where resetting by gravity and rebound force may be impossible. The push rod 6 of the present invention is connected to the cavity 57 by a threaded connection. Under the action of the threaded connection, the axial thrust of the push rod 6 cannot cause the push rod 6 to rotate (that is, after the second rack 3 is pushed into place, the push rod 6 will not move downward after losing the power source (such as the cylinder), thereby achieving a self-locking effect. Compared with the existing technology, the present invention does not need to be equipped with a power source at each workstation, which not only facilitates layout but also reduces costs.

[0042] Specifically, a positioning groove 56 is provided on the circumferential side of the connecting portion 52 , and a positioning pin 104 corresponding to the positioning groove 56 is connected to the mounting seat 1 .

[0043] By adopting the above technical solution, the circumferential positioning of the connecting portion 52 is achieved by the cooperation between the positioning pin 104 and the positioning groove 56, so that the expansion seat 5 and the mounting seat 1 can be quickly locked by screws.

[0044] Specifically, the limiting portion 62 is a polygonal structure, preferably a hexagonal structure in this embodiment. A limiting groove 71 corresponding to the limiting portion 62 is provided on the gear 7, and the circumference of the gear 7 is locked with the limiting portion 62 by screws.

[0045] By adopting the above technical solution, the gear 7 and the push rod 6 are connected in a limited position, so that the push rod 6 rotates together with the gear 7.

[0046] Example 2

[0047] The difference between this embodiment and the first embodiment is that: specifically, a through hole 65 is provided inside the push rod 6 .

[0048] By adopting the technical solution, it can be used to remove iron chips generated during processing.

[0049] Embodiment 3

[0050] The difference between this embodiment and embodiment 1 is that, specifically, the right end of the second rack 3 is connected with one end of the tension spring 4, and the other end of the tension spring 4 is fixed on the platform on which the base plate 101 is installed, such as the rotating disc of the rotating disc mechanism.

[0051] By adopting the above technical scheme, the tension spring 4 acts on the right end of the second rack 3 to exert a pulling force on the right end of the second rack 3, so as to avoid that the vibration generated by machining causes the rotating of the ejector rod 6 to result in the downward movement of the ejector rod 6 in the expanded state.

[0052] Embodiment 4

[0053] Further, the implementation method of the mechanism for expanding the inner cylindrical surface of the shuttle shell according to the present application comprises the following steps:

[0054] (I) the pushing end pushes the second rack 3 to move to drive the gear 7 to rotate clockwise;

[0055] (II) the rotation of the gear 7 drives the ejector rod 6 to rotate clockwise, and under the action of the threaded part 63 and the cavity 57 being threadedly connected, the ejector rod 6 is driven to move upward, so that the inner tapered part 58 and the outer tapered part 64 are cooperated to expand the expansion part 54, thereby realizing the expanding action.

[0056] (III) the pushing end pushes the first rack 2 to move to drive the gear 7 to rotate counterclockwise;

[0057] (IV) the rotation of the gear 7 drives the ejector rod 6 to rotate counterclockwise, thereby driving the ejector rod 6 to move downward, the outer tapered part 64 of the ejector rod 6 is separated from the inner tapered part 58, and the expansion part 54 is reset under the action of the restoring force of the deformation part 53, thereby realizing the loosening action.

[0058] In the present application, the modulus of the gear 7 is 1.5 mm, the number of teeth is 26, the first rack 2 and the second rack 3 are both 20-tooth straight racks, the threaded part 63 is M14*2 thread, the degree of the outer tapered part 64 is 19°, and the degree of the inner tapered part 58 is 20°. The 19° outer tapered part 64 is cooperated with the 20° inner tapered part 58, so that when the two are in contact, the top position of the inner tapered part 58 is always stressed, the rigidity of this position (further away from the deformation part 53) is small and the deflection is large, and it is easy to be elastically deformed.

[0059] In the present application, when the second rack 3 is pushed in by 62.8 mm, the gear 7 rotates 13 teeth (i.e. half a turn), so that the ejector rod 6 rotates upward by 1 mm; the 19° outer tapered part 64 at the top of the ejector rod 6 cooperates with the 20° inner tapered part 58 to expand the expansion part 54, and the length ratio of the straight sides of the corresponding triangle of 19° is 3:1, i.e. the upward movement of the ejector rod 6 by 1 mm will deform each side of the expansion part 54 outward by 0.33 mm.

[0060] In the present application, the disc mechanism is taken as an example, the air cylinder 8 corresponding to the first rack 2 and the second rack 3 can be respectively installed on one side of the feeding station, the air cylinder corresponding to the first rack 2 is installed on one side of the discharging station, in the feeding action, the first rack 2 is first pushed in by the air cylinder corresponding to the first rack 2, then the air cylinder corresponding to the first rack 2 is retracted, so that the expansion part 54 is in the loosening state, after the shell is loaded, the second rack 3 is pushed in by the air cylinder corresponding to the second rack 3, so that the expansion part 54 is in the expansion state.

[0061] In summary, the present application can control the lifting of the ejector rod 6 by pushing the first rack 2 and the second rack 3 respectively, so that the expansion and loosening actions of the expansion part 54 are completely controllable, and the problem that the existing technology cannot be reset by using gravity and elastic force is solved. The ejector rod 6 is connected with the cavity 57 through threads, under the action of the threaded connection, the axial thrust of the ejector rod 6 cannot make the ejector rod 6 rotate, so that the self-locking effect is realized, compared with the prior art, the present application does not need to be equipped with a power source at each station, which not only facilitates the layout, but also reduces the cost. The inside of the ejector rod 6 is provided with a through hole 65, which can be used for iron filings generated during the machining. The present application applies tension to the right end of the second rack 3 through the tension spring 4, so as to avoid the vibration caused by machining in the expansion state, which causes the rotation of the ejector rod 6 and the downward movement of the ejector rod 6.

[0062] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A mechanism for tightening the inner cylindrical surface of a bobbin case, characterized in that: It includes a mounting seat, an expansion seat is connected to the top of the mounting seat, a cavity is provided inside the expansion seat, a push rod is provided inside the cavity, the push rod is threadedly connected to the cavity, the lower end of the push rod is connected to a gear located inside the mounting seat, and the mounting seat is also provided with a first rack and a second rack arranged symmetrically, and the first rack and the second rack are respectively meshed with the gears.

2. A mechanism for tightening the inner cylindrical surface of a bobbin case according to claim 1, characterized in that: The mounting seat comprises a bottom plate, a seat body is connected to the top of the bottom plate, and dustproof plates are respectively connected to both sides of the seat body.

3. The mechanism for tightening the inner cylindrical surface of a bobbin case according to claim 1, characterized in that: The expansion seat is provided with an inserting portion, a connecting portion, a deforming portion and an expansion portion in sequence from bottom to top, and the deforming portion and the expansion portion are provided with a cross-shaped vertically arranged notch.

4. A mechanism for tightening the inner cylindrical surface of a bobbin case according to claim 3, characterized in that: A positioning groove is provided on the circumferential side of the connecting portion, and a positioning pin corresponding to the positioning groove is connected to the mounting seat.

5. The mechanism for tightening the inner cylindrical surface of a bobbin case according to claim 1, characterized in that: The push rod is provided with a positioning portion, a limiting portion, a threaded portion and an outer cone portion in sequence from bottom to top, and the upper end of the cavity is provided with an inner cone portion corresponding to the outer cone portion.

6. The mechanism for tightening the inner cylindrical surface of a bobbin case according to claim 1, characterized in that: A through hole is provided inside the push rod.

7. The mechanism for tightening the inner cylindrical surface of a bobbin case according to claim 5, characterized in that: The limiting portion is a polygonal structure, and the gear is provided with a limiting groove corresponding to the limiting portion.

8. The mechanism for tightening the inner cylindrical surface of a bobbin case according to claim 1, characterized in that: One end of the second rack is a pushing end, and the other end of the second rack is connected to a tension spring.

9. A method for implementing a mechanism for tightening the inner cylindrical surface of a bobbin case according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Push the second rack at the push end to move the gear clockwise; (2) The rotation of the gear drives the push rod to rotate clockwise, and under the action of the threaded connection between the threaded part and the cavity, the push rod is driven to move upward, thereby expanding the tightening part under the cooperation of the inner cone and the outer cone, realizing the tightening action; (3) Push the first rack at the pushing end to move the gear to rotate counterclockwise; (4) The rotation of the gear drives the push rod to rotate counterclockwise, thereby driving the push rod to move downward, the outer cone part of the push rod is separated from the inner cone part, and the expansion part is reset under the restoring force of the deformation part, thereby realizing the loosening action.

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