Mechanism for preventing bush from falling off from sliding block and mold

Abstract

The mechanism comprises an insert, a plurality of cutting grooves are formed in one end of the insert in an annular array mode, the cutting grooves penetrate through the inner wall and the outer wall of the insert, and the length direction of the cutting grooves is parallel to the axis of the insert; elastic blades are formed on the insert parts between the adjacent cutting grooves, and barbs are arranged on the surfaces, facing outwards in the radial direction, of the elastic blades; the portion between the barb and the root of the elastic blade can penetrate through and make contact with the lining, and a wedge face is formed between the barb and the tail end of the elastic blade. The sliding block is provided with a sliding block hole allowing the end of the insert to enter, the insert has the axial reciprocating linear freedom degree close to or away from the sliding block, and the inner wall of the sliding block hole can make contact with the inclined wedge face and drive the elastic blade to elastically deform inwards in the radial direction. According to the utility model, the elastic blade, the barb, the tapered wedge surface and the sliding block hole are adopted, and the mutual diameter size relationship is utilized, so that the bushing can be conveniently separated from the insert at the appointed time. And the device is suitable for the condition that the bushing demolding direction is different from the mold opening direction.

Description

Technical Field

[0001] The utility model relates to the field of mold action mechanisms, in particular to a slide block anti-bushing falling mechanism and a mold. Background Art

[0002] like Figure 1 , Figure 2 As shown, there is an existing injection molded plastic part 2, whose bushing 3 demoulding (opening) direction is inconsistent with the mold opening and closing direction, and a slider core pulling is required. Figure 2 As shown, three bushings 3 are arranged parallel to each other, and the mold opening direction K is almost perpendicular to the axis of the bushing 3 .

[0003] The technical difficulty in solving this injection molding demoulding is that the bushing 3 is a straight-extending tubular component, which needs to be inserted into the slider insert with clearance fit. However, during the slider push and the machine rotation process, the bushing 3 may slip out of the insert, which may cause the mold to be crushed or the product to be missing the bushing. Therefore, the insert of the bushing 3 must consider the positioning of the bushing 3, and also consider that the bushing 3 is stably limited at the specified time and can be smoothly removed when needed. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a slider anti-bushing falling mechanism and a mold, wherein the elastic blade, the barb, the inclined wedge surface and the slider hole utilize the diameter size relationship between each other to facilitate the bushing to be separated from the insert at a specified time. It is suitable for use in the case where the bushing demoulding direction is different from the mold opening direction.

[0005] In order to solve the above problems, the utility model provides a slider anti-bushing falling mechanism and a mold. In order to achieve the above purpose, the technical solution adopted by the utility model to solve its technical problems is:

[0006] On the one hand, a slider anti-bushing fall-off mechanism comprises: an insert having a plurality of grooves in a circular array at one end, the grooves passing through the inner wall and the outer wall of the insert, and the length direction of the grooves themselves being parallel to the axis of the insert itself; the insert portion between adjacent grooves constitutes an elastic blade, and the radially outward side of the elastic blade is provided with a barb; the barb to the root of the elastic blade can pass through and contact the bushing, and an inclined wedge surface is formed between the barb and the end of the elastic blade; a slider having a slider hole for the insert end to enter, the insert having an axial reciprocating linear freedom to approach or move away from the slider, the inner wall of the slider hole being able to contact the inclined wedge surface and drive the elastic blade to elastically deform radially inward.

[0007] The beneficial effect of adopting the above technical solution is that the mechanism uses elastic blades, barbs, and inclined wedge surfaces to facilitate the sleeve to be placed on the insert, but prevent the sleeve from falling off the insert at any time. Only when the insert is contacted and limited by the slider hole when the mold slider moves as specified, and the barbs are all contracted radially inward by the inner diameter of the slider hole, can the sleeve avoid all barbs and detach from the insert, which makes it easier for the sleeve to complete the injection molding action with other adjacent parts. It is particularly suitable for use in situations where the sleeve demolding direction is different from the mold opening direction.

[0008] The function of the barb is to limit the axial direction in one direction to prevent the bushing from slipping out. A circle of grooves can relatively form elastic blades, which have a certain degree of swinging ability, which is manifested in that the end thereof has a certain degree of radial displacement freedom.

[0009] This technical solution uses multi-faceted slotting and adding barbs to make the insert part have the characteristics of elastic expansion and stop. Combined with the mold slider mechanism, the part has the dual effects of positioning and foolproofing, effectively avoiding the risk of the bushing slipping.

[0010] The overall structure is simple and practical, requires very little space and has a wide range of applications.

[0011] As a further improvement of the utility model, the insert includes a main section and an insertion section, the thickness of the main section is greater than that of the insertion section, and the junction between the main section and the insertion section forms a step surface, which can contact one end of the bushing.

[0012] The beneficial effect of adopting the above technical solution is that the step surface limits the extreme position of the bushing in another direction.

[0013] As a further improvement of the present invention, the groove is located on the insertion section, and the axial extension length of the groove is smaller than the axial length of the insertion section.

[0014] The beneficial effect of adopting the above technical solution is that the insert as a whole can be an integral component, and only through the cutting of grooves can its part have elastic swinging ability.

[0015] As a further improvement of the utility model, when the elastic blade is not subjected to external force other than gravity, the diameter corresponding to the position of the insertion section excluding the barb is smaller than the inner diameter of the bushing; the sum of the diameter corresponding to the position of the insertion section excluding the barb and the radial protrusion height of the two barbs is greater than the inner diameter of the bushing.

[0016] The beneficial effect of adopting the above technical solution is: explaining the positional relationship between the barb, the inner diameter of the bushing, and the inner diameter of the slider hole, so as to ensure when the bushing is limited or loosened.

[0017] As a further improvement of the utility model, the inclined wedge surfaces of all elastic blades overlap with the inclined cone surface of the same space.

[0018] The beneficial effect of adopting the above technical solution is that the inclined wedge surface is easy to contact with the edge of the slider hole, and it is also easy for the edge of the slider hole to squeeze the inclined wedge surface.

[0019] As a further improvement of the present invention, the inner diameter of the slider hole is not larger than the inner diameter of the bushing.

[0020] The beneficial effect of adopting the above technical solution is that the small inner diameter of the slider hole can ensure that all the barbs are gathered and shrunk.

[0021] As a further improvement of the present invention, the cross-sectional profile of the outer wall of the insertion section is circular, and the cross-sectional profile of the outer wall of the main body section is a rounded rectangle.

[0022] As a further improvement of the utility model, the outer wall of the main body section protrudes radially outward to form a tenon.

[0023] The beneficial effect of adopting the above technical solution is that the tenon can prevent the insert from rotating.

[0024] As a further improvement of the present invention, the bushing is made of metal and includes an axial joint.

[0025] The beneficial effect of adopting the above technical solution is that the bushing and the injection molded part can be made of two different materials, and the bushing can play the role of pin and shaft connection on the composite injection molded part.

[0026] On the other hand, the mold includes the slider bushing prevention mechanism as mentioned above.

[0027] The beneficial effect of adopting the above technical solution is that the mold using this mechanism does not need to significantly change its mold opening direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a three-dimensional diagram of a plastic part in one embodiment of the utility model;

[0030] Figure 2 It is a three-dimensional diagram of a plastic part in one embodiment of the utility model;

[0031] Figure 3 It is a three-dimensional diagram of a bushing in one embodiment of the utility model;

[0032] Figure 4 It is a three-dimensional diagram of an insert according to one embodiment of the utility model;

[0033] Figure 5 It is a main body diagram of an insert according to one embodiment of the utility model;

[0034] Figure 6 It is an assembly diagram of an insert and a bushing in one embodiment of the utility model;

[0035] Figure 7 It is a schematic diagram of the assembly of an insert, a bushing, and a slider in one embodiment of the utility model;

[0036] Figure 8 It is an AA cross-sectional view of an implementation manner of the utility model.

[0037] 1-slider; 11-slider hole; 2-plastic part; 3-bushing; 31-axial through-channel; 32-axial joint; 4-insert; 41-tenon; 42-main section; 43-insertion section; 44-groove; 45-elastic blade; 46-barb; 47-wedge surface; 48-step surface; K-mold opening direction; J-axial clearance; DK-barb convexity; Z1-first diameter; Z2-second diameter; Z3-third diameter. DETAILED DESCRIPTION

[0038] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0039] In order to achieve the purpose of the utility model, a slider anti-bushing falling mechanism comprises: an insert 4, a plurality of grooves 44 are arranged in an annular array at one end, the grooves 44 pass through the inner wall and the outer wall of the insert 4, and the length direction of the grooves 44 themselves is parallel to the axis of the insert 4 itself; the part of the insert 4 between adjacent grooves 44 constitutes an elastic blade 45, and the radially outward side of the elastic blade 45 is provided with a barb 46; the barb 46 can pass through and contact the bushing 3 to the root of the elastic blade 45, and an inclined wedge surface 47 is formed between the barb 46 and the end of the elastic blade 45; a slider 1 has a slider hole 11 for the end of the insert 4 to enter, the insert 4 has an axial reciprocating linear freedom to approach or move away from the slider 1, and the inner wall of the slider hole 11 can contact the inclined wedge surface 47 and drive the elastic blade 45 to elastically deform radially inward.

[0040] The beneficial effects of adopting the above technical solution are: the mechanism uses elastic blades, barbs, and inclined wedge surfaces to facilitate the sleeve to be put on the insert, but prevent the sleeve from falling off the insert at any time. Only when the insert is limited by the contact of the slider hole and the inner diameter of the slider hole is used to shrink all the barbs radially inward, the sleeve can avoid all the barbs and detach from the insert. At this time, it is convenient for the sleeve to complete the injection molding action with other adjacent parts. It is particularly suitable for use in the case where the demoulding direction of the sleeve is different from the mold opening direction. The function of the barb is to limit the axial direction to prevent the sleeve from sliding out. A circle of grooves can relatively form elastic blades, and the elastic blades have a certain degree of swinging ability, which is manifested by a certain degree of radial displacement freedom at the end. The technical solution uses multi-faceted grooving and the addition of barbs to make the parts as inserts have the characteristics of elastic expansion and contraction and stop. Combined with the mold slider mechanism, the parts have the dual effects of positioning and foolproofing at the same time, effectively avoiding the risk of the sleeve slipping off. The overall structure is simple and practical, requires very little space and has a wide range of applications.

[0041] In other embodiments of the present invention, the insert 4 includes a main section 42 and an insertion section 43. The thickness of the main section 42 is greater than that of the insertion section 43. The junction between the main section 42 and the insertion section 43 forms a step surface 48, and the step surface 48 can contact one end of the bushing 3.

[0042] The beneficial effect of adopting the above technical solution is that the step surface limits the extreme position of the bushing in another direction.

[0043] In some other embodiments of the present invention, the groove 44 is located on the insertion section 43 , and the axial extension length of the groove 44 is smaller than the axial length of the insertion section 43 .

[0044] The beneficial effect of adopting the above technical solution is that the insert as a whole can be an integral component, and only through the cutting of grooves can its part have elastic swinging ability.

[0045] In other embodiments of the present invention, when the elastic blade 45 is not subjected to external force other than gravity, the diameter of the insertion section 43 excluding the position of the barb 46 is smaller than the inner diameter of the bushing 3; the sum of the diameter of the insertion section 43 excluding the position of the barb 46 and the radial protrusion height of the two barbs 46 is greater than the inner diameter of the bushing 3.

[0046] like Figure 6 As shown, Figure 6 The dotted line is used to express the visually blocked area, that is, to express the outline of the insertion section 43. After the insert 4 is assembled with the bushing 3, and one end of the bushing 3 abuts against the step surface 48, the axial distance between the barb 46 and the other end of the bushing 3 is the axial gap J.

[0047] like Figure 5As shown, the radial outward convexity of the barb 46 is the barb convexity DK. The diameter of the insertion section 43 where there is no elastic blade 45 is the first diameter Z1. The distance between the top ends of the two barbs 46 that are farthest apart is the second diameter Z2, which expresses the thickest size of the insertion section 43. The value of the first diameter Z1 is smaller than the second diameter Z2.

[0048] like Figure 8 As shown, the diameter of the slider hole 11 is the third diameter Z3, the third diameter Z3 is smaller than the second diameter Z2, and the third diameter Z3 is larger than the first diameter Z1.

[0049] The beneficial effect of adopting the above technical solution is: explaining the positional relationship between the barb, the inner diameter of the bushing, and the inner diameter of the slider hole, so as to ensure when the bushing is limited or loosened.

[0050] In other embodiments of the present invention, the inclined wedge surfaces of all elastic blades 45 overlap with the inclined cone surface of the same space.

[0051] The beneficial effect of adopting the above technical solution is that the inclined wedge surface is easy to contact with the edge of the slider hole, and it is also easy for the edge of the slider hole to squeeze the inclined wedge surface.

[0052] In other embodiments of the present invention, the inner diameter of the slider hole 11 is not larger than the inner diameter of the bushing 3. The beneficial effect of the above technical solution is that the small inner diameter of the slider hole can ensure that all the barbs are gathered and shrunk.

[0053] like Figure 4 As shown, in some other embodiments of the present invention, the cross-sectional profile of the outer wall of the insertion section 43 is circular, and the cross-sectional profile of the outer wall of the main body section 42 is a rounded rectangle.

[0054] like Figure 4 As shown, in other embodiments of the present invention, a tenon 41 is radially protruded outward from the outer wall of the main body section 42 .

[0055] The beneficial effect of adopting the above technical solution is that the tenon can prevent the insert from rotating.

[0056] like Figure 3 As shown, in some other embodiments of the present invention, the bushing 3 is made of metal, and the bushing 3 includes an axial seam 32 .

[0057] The bushing 3 is formed by bending a metal hardware, and the middle portion of the bushing 3 is provided with an axial through passage 31 for the insert 4 to pass through.

[0058] The mold includes the above-mentioned mechanism for preventing the sliding block from falling off the bushing. The mold is an injection mold.

[0059] In actual operation, when the slider 1 moves forward, the elastic blade 45 of the insert 4 contacts and interferes with the inner wall of the slider hole 11, and the elastic blade 45 bends inward until one end of the bushing 3 contacts the plane of the slider 1, ensuring the positioning of the bushing 3 in the mold, and waiting for the mold to complete the plastic filling action. At this time, the elastic blade 45 always remains in an inward bending state. When the slider 1 moves backward, because the elastic blade 45 always remains in an inward bending state, the barb 46 will not hook the bushing 3, and the insert 4 can smoothly leave the bushing 3, thereby completing the core pulling action.

[0060] The working principle of the mechanism is as follows: First, when the bushing 3 is implanted into the insert 4, the elastic blades 45 of the head of the insert 4 bend inwards until the bushing 3 is fully implanted, and then the elastic blades 45 of the head of the insert 4 are restored. Second, when the slider 1 moves forward, the elastic blades 45 interfere with the slider hole 11, and the elastic blades 45 bend inwards until one end of the bushing 3 is against the plane of the slider 1. Ensure the positioning of the bushing 3 in the mold, wait for the mold to complete the plastic filling action, and after the injection molding is completed, open the mold. When the slider 1 retreats, the elastic blades 45 are always in an inward bending state, so they can smoothly leave the bushing 3 and complete the core pulling action.

[0061] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A mechanism for preventing a sliding block from falling off a bushing, characterized in that: include: The insert has a plurality of grooves in a circular array at one end, the grooves penetrate the inner wall and the outer wall of the insert, and the length direction of the grooves is parallel to the axis of the insert; the insert portion between adjacent grooves constitutes an elastic blade, and the radially outward side of the elastic blade is provided with a barb; the barb can pass through and contact the bushing from the root of the elastic blade, and an inclined wedge surface is formed from the barb to the end of the elastic blade; The slider has a slider hole for the insert end to enter, the insert has axial reciprocating linear freedom to approach or move away from the slider, the inner wall of the slider hole can contact the inclined wedge surface and drive the elastic blade to elastically deform radially inward.

2. The anti-bushing-off mechanism for a slider according to claim 1, characterized in that: The insert comprises a main body section and an insert section. The thickness of the main body section is greater than that of the insert section. A step surface is formed at the junction of the main body section and the insert section. The step surface can contact one end of the bushing.

3. The anti-bushing-off mechanism for a slider according to claim 2, characterized in that: The cutting groove is located on the insertion section, and the axial extension length of the cutting groove is smaller than the axial length of the insertion section.

4. The anti-bushing-off mechanism for a slider according to claim 2, characterized in that: When the elastic blade is not subjected to external force other than gravity, the diameter of the insertion section excluding the barb position is smaller than the inner diameter of the bushing; the sum of the diameter of the insertion section excluding the barb position and the radial protrusion height of the two barbs is greater than the inner diameter of the bushing.

5. The anti-bushing-off mechanism for a slider according to claim 1, characterized in that: The inclined wedge surfaces of all elastic blades coincide with the inclined cone surface in the same space.

6. The anti-bushing-off mechanism for a slider according to claim 1, characterized in that: The inner diameter of the slider hole is not greater than the inner diameter of the bushing.

7. The anti-bushing-off mechanism for a slider according to claim 2, characterized in that: The cross-sectional profile of the outer wall of the insertion section is circular, and the cross-sectional profile of the outer wall of the main body section is a rounded rectangle.

8. The anti-bushing-off mechanism for a slider according to claim 2, characterized in that: The outer wall of the main body section protrudes radially outward to form a tenon.

9. The anti-bushing-off mechanism for a slider according to claim 1, characterized in that: The bushing is made of metal and includes an axial seam.

10. The mold is characterized by: It comprises a slider bushing prevention mechanism as claimed in any one of claims 1 to 9.

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