Rapid tensioning supporting device
Through a fast tightening support device, the combined structure of the middle support plate, side support plate, step circle and step inner hole, combined with the locking mechanism and elastic ring, the problem of tightening the inner hole of the thin-wall workpiece of low-hardness material is solved, achieving a fast, safe and controllable tightening effect.
Patent Information
- Application Number
- CN202421299825.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-07
AI Technical Summary
The prior art is difficult to effectively tighten the inner holes of thin-walled workpieces of low-hardness materials, especially workpieces with smaller length and diameter than those of the inner holes. The traditional sleeves are prone to scratches or crushes the inner hole surface of the workpiece, and the tightening force is difficult to control.
A rapid tightening support device is adopted, which includes a middle support plate, a side support plate, a step circle and a step inner hole, and supports and tighten the inner hole of the workpiece through a locking mechanism and an elastic ring.
It achieves rapid tightening of the inner holes of thin-walled cylinders, provides support, prevents the deformation of the workpiece, and protects the surface of the inner holes of the workpiece, ensures product quality, and improves production efficiency.
Smart Images
Figure CN222588827U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of mechanical product processing, relates to the tensioning of inner holes of thin-walled workpieces, and is specifically a rapid tensioning support device. Background Art
[0002] In mechanical products, high-precision thin-walled workpieces often need to be processed. Due to the thin wall of the workpiece, the strength of the workpiece is poor, and deformation is easy to occur during the clamping process of the parts, which makes the product unqualified. Therefore, the strength of the parts can be improved by tightening the inner hole, and the tightening device can play a supporting role; in addition, some thin-walled workpieces have a short inner hole length and a large diameter, and a small aspect ratio, even reaching ≤8 or less; due to product structure limitations, the general long mandrel tightening device cannot be used to tighten the inner hole, which brings great difficulties to actual production; in addition, the installation must be able to meet the requirements of easy operation and quick installation, and adapt to the needs of efficient production.
[0003] The traditional method generally uses a tapered mandrel and an expansion sleeve to tighten the inner hole. The expansion sleeve is generally made of steel and has multiple grooves on it so that the outer diameter of the expansion sleeve can be deformed and expanded during tightening. However, since the product parts are made of low-hardness materials, if steel expansion sleeves are used for tightening, during the installation process, the expansion sleeves can easily scratch, squeeze, and crush the inner hole surface of the low-hardness material workpiece, causing failure, which is not suitable for both product quality and rapid production. In addition, since there is no axial limit device between the expansion sleeve and the tapered mandrel, the tightening force of the expansion sleeve fluctuates during actual use and is difficult to control, so it is not suitable for thin-walled cylindrical parts. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, the purpose of the utility model is to provide a rapid tensioning support device for tensioning thin-walled workpieces made of low-hardness materials and with a small inner hole aspect ratio, thereby improving their strength, reducing the problem of deformation of thin-walled workpieces caused by low strength, and greatly improving work efficiency.
[0005] The utility model is realized by adopting the following technical solutions:
[0006] A quick tensioning support device comprises a middle support disk with a central through hole and at least one side support disk; the side support disk and the middle support disk are circular support disks with the same diameter, at least one step circle is arranged on one side of the side support disk, and a step inner hole concentric with the middle support disk is arranged on one side or both side end faces of the middle support disk, and the diameter of at least one step circle is smaller than the diameter of the step inner hole; the side support disk and the middle support disk are locked by a locking mechanism, at least one step circle is assembled into the step inner hole of the middle support disk, the step surface of the side support disk with the maximum diameter perpendicular to the axial direction of the circular support disk and the end face of the middle support disk form a circumferential annular groove, an elastic ring is installed in the circumferential annular groove, and the side support disk and the middle support disk are matched with the inner hole of the workpiece with a small clearance.
[0007] The step circle is a cylinder whose diameter is smaller than the diameter of the adjacent side support disk portion, and the height of the cylinder is the step height of the step circle.
[0008] The inner hole of the step is an inward circular groove with a diameter slightly smaller than the maximum support of the middle support plate.
[0009] When in use, first assemble the step circle of the side support plate and the step inner hole of the middle support plate and lock them through the locking device, install the elastic ring into the circumferential annular groove, and then assemble the utility model and the inner hole of the workpiece, and further lock the assembly of the side support plate and the middle support plate. The width of the circumferential annular groove will become smaller, and the elastic ring will be squeezed and deformed in this process to achieve support for the inner hole of the workpiece.
[0010] Further preferably, the side support plate is provided with a central through hole, the locking mechanism includes a nut and a positioning shaft, the positioning shaft has a base and a shaft portion, the free end of the shaft portion is provided with a thread, the minimum diameter of the base is larger than the central through hole of the circular support plate, and the positioning shaft portion is fixed by passing the positioning shaft portion through the central through hole of the circular support plate and then being fixed by a nut.
[0011] Further preferably, an adjustment pad is included. When there are multiple side support plates, the adjustment pad is arranged between the side support plate and the middle support plate, and the adjustment pad is arranged between the side support plates. The size of the adjustment pad is larger than the size of the central through hole and does not interfere with the position of the weight-reducing hole. The adjustment pad can be manually controlled to control the locking force between the circular support plates, so that the supporting force of the elastic ring on the inner hole of the workpiece is not too large or too small.
[0012] Further preferably, a plurality of elastic rings may be installed in the circumferential annular groove, and the elastic rings are separated by gaskets.
[0013] Further preferably, at least one side support disk has a central core shaft, and the other side support disks are provided with a central through hole, the free end of the central core shaft is threaded, the central through holes of the other side support disks are matched with the central core shaft with a small clearance, the central through hole of the middle support disk is matched with the central core shaft with a small clearance, the round support disk with the central through hole passes through the central core shaft and is fixed with a nut, and the free end of the central core shaft is the end of the central core shaft away from the side support disk. When used, the central core shaft of the side support disk with the central core shaft passes through the round support disk with the central through hole and is fixed with a nut.
[0014] Further preferably, the side support plate and the middle support plate include one or more weight-reducing holes, and the positions of the weight-reducing holes and the central through hole do not affect each other.
[0015] Further preferably, at least one of the side support plates has a small outer diameter cylinder for clamping that is concentric with the side support plate and extends outward from its outer end surface. The middle support plate and the plurality of side support plates are locked together and assembled with the inner hole of the workpiece by a machine tool, and the side support plate is provided with a small outer diameter cylinder for clamping by the machine tool, and the assembly of the circular support plate and the workpiece is achieved by the machine tool.
[0016] Further preferably, a stepped inner hole concentric with the side support disc is provided on the other side of the side support disc. When in use, the stepped circle of one side support disc is assembled into the stepped inner hole of another side support disc, and the assembly of multiple side support discs is realized by analogy. The stepped surface of the maximum diameter of one side support disc perpendicular to the axial direction of the circular support disc and the end face of the side with the stepped inner hole of another side support disc form a circumferential annular groove, and an elastic ring is installed in the circular annular groove.
[0017] Further preferably, in order to facilitate the locking between the circular support plates, the free end of the central core shaft is provided with a parallel flat head, and when in use, the parallel flat head can be clamped with a wrench for further locking.
[0018] The utility model has the following beneficial effects:
[0019] First, it can achieve rapid tightening of the inner hole of a thin-walled cylinder;
[0020] Second, it can play a supporting role when the thin-walled cylinder is subjected to the clamping force on the outer diameter;
[0021] Third, it can protect the inner hole surface of low-hardness material workpieces to prevent crushing, scratching and other phenomena;
[0022] Fourth, it can realize the tension support of workpieces with small aspect ratio of the hole size in thin-walled cylinder;
[0023] Fifth, after the size of the elastic ring is selected, the size of the groove width C and the adjustment pad thickness B can be determined by confirming the extrusion tension force, which can ensure that the extrusion tension force of the elastic ring is consistent each time it is installed in the locked state, avoiding the phenomenon of the extrusion tension force being large and small;
[0024] Sixth, due to the use of a small clearance fit structure, the coaxiality between the chuck and the inner hole of the workpiece is high, and it can be applied to high-precision mandrels. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0027] Figure 1 A schematic structural diagram showing a circumferential annular groove of the utility model.
[0028] Figure 2 A schematic diagram showing the structure of two circumferential annular grooves of the utility model.
[0029] In the figure: 1-fastener, 2-middle support plate, 3-side support plate, 4-step circle, 41-step surface, 5-step inner hole, 6-circumferential annular groove, 7-elastic ring, 81-flat washer, 82-spring washer, 83-nut, 9-positioning shaft, 10-adjusting pad, 11-center core shaft, 12-weight reduction hole, 13-parallel flat head. DETAILED DESCRIPTION
[0030] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the scheme of the utility model will be further described below. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.
[0031] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.
[0033] The specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.
[0034] A quick tightening support device comprises a middle support disk 2 with a central through hole and at least one side support disk 3; the side support disk 3 and the middle support disk 2 are circular support disks with the same diameter, at least one step circle 4 is arranged on one side of the side support disk 3, and a step inner hole 5 concentric with the middle support disk 2 is arranged on one side or both side end faces of the middle support disk 2, and the diameter of at least one step circle 4 is smaller than the diameter of the step inner hole 5; the side support disk 3 and the middle support disk 2 are locked by a locking mechanism, at least one step circle 4 is assembled into the step inner hole 5 of the middle support disk 2 and there is a small gap in the middle; the step surface 41 of the side support disk 3 with the maximum diameter perpendicular to the axial direction of the circular support disk forms a circumferential annular groove 6 with the end face of the middle support disk 2, and an elastic ring 7 is installed in the circumferential annular groove 6, and the side support disk 3 and the middle support disk 2 are matched with the inner hole of the workpiece with a small gap.
[0035] After the utility model is locked, the width of the circumferential annular groove 6 becomes smaller, and the elastic ring 7 is deformed after being squeezed. Since the matching clearance between the outer diameter of the circular support disk and the inner hole of the workpiece is small, the elastic ring 7 is tightened against the inner hole of the workpiece to play a supporting role. The step circle 4 assembled with the step inner hole 5 on the side support disk 3 is provided with a chamfer to facilitate the assembly of the side support disk 3 and the middle support disk 2, and the two step surfaces 41 of the step circle 4 forming the circumferential annular groove 6 are provided with arcs to facilitate the installation of the elastic ring 7.
[0036] The locking mechanism of the utility model is provided with a spring washer 82 and a flat washer 81 to prevent the nut 83 from loosening. When the locking mechanism is in a loosened state, the maximum outer diameter of the elastic ring 7 is consistent with or slightly smaller than the maximum outer diameter of the support plate, which is convenient for the device to be installed in the inner hole of the workpiece. Embodiment 1:
[0037] This embodiment includes a middle support plate 2 with a stepped inner hole 5 on one end surface, a side support plate 3 with a central through hole, and a step circle 4 with a diameter slightly smaller than that of the side support plate 3 on one side.
[0038] The locking mechanism includes a nut 83 and a positioning shaft 9. The positioning shaft 9 has a base and a shaft portion. A thread is arranged at the free end of the shaft portion. The minimum diameter of the base is larger than the central through hole of the circular support disk. A fixing hole is arranged on the base. After the central through hole of the circular support disk passes through the shaft portion of the positioning shaft 9, the base and the middle support disk 2 are fixedly connected by a fastener 1, and then the circular support disk is locked by a nut 83.
[0039] It also includes an adjustment pad 10, which is arranged between the side support plate 3 and the middle support plate 2. The size of the adjustment pad 10 is larger than the size of the central through hole and does not interfere with the position of the weight-reducing hole 12.
[0040] When in use, first assemble the step circle 4 of the side support plate 3 and the step inner hole 5 of the middle support plate 2 and lock them through the locking device, install the elastic ring 7 into the circumferential annular groove 6, and then assemble the utility model and the inner hole of the workpiece, and further lock the assembly of the side support plate 3 and the middle support plate 2. The width of the circumferential annular groove 6 will become smaller, and the elastic ring 7 will be squeezed and deformed in this process. An adjustment pad 10 is provided between the side support plate 3 and the middle support plate 2, so that the elastic ring 7 can be squeezed and deformed under human control, thereby supporting the inner hole of the workpiece. Embodiment 2:
[0041] This embodiment includes a middle support plate 2 with stepped inner holes 5 on both side end faces, a side support plate 3 with a central through hole and two stepped circles 4 on one side, and a side support plate 3 with a central core shaft 11 and two stepped circles 4 on one side of the central core shaft 11.
[0042] The free end of the central mandrel 11 is threaded, and the central through hole of the circular support plate and the central mandrel 11 are matched with a small clearance and the matching surface roughness value is small, so that there is no jamming phenomenon when the locking mechanism is locked or loosened. The circular support plate with a central through hole passes through the central mandrel 11 and is fixed with a nut 83. The free end of the central mandrel 11 is the end of the central mandrel 11 away from the side support plate 3. The free end of the central mandrel 11 is provided with a parallel flat head 13, and the parallel flat head 13 can be clamped with a wrench for further locking when in use.
[0043] The invention also includes an adjustment pad 10, which is arranged between adjacent circular support plates. The adjustment pad 10 can be arranged to manually control the locking force between the circular support plates so that the supporting force of the elastic ring 7 on the inner hole of the workpiece is not too large or too small.
[0044] When in use, firstly assemble the step circles 4 with smaller diameters of the two side support plates 3 with the step inner holes 5 of the middle support plate 2 and lock them through the locking device, and install the elastic ring 7 into the circumferential annular groove 6. When assembling, the center core shaft 11 of the side support plate 3 with the center core shaft 11 passes through the middle support plate 2 with the center through hole and the other side support plate 3 in turn, and then install the flat washer 81 and the spring washer 82 in turn, and finally lock it with the nut 83.
[0045] Then the utility model is assembled with the inner hole of the workpiece, and the positions of the two circumferential annular grooves 6 are exactly at the deepest and shallowest positions of the inner hole of the workpiece. At this time, the locking mechanism further locks the assembly of the side support plate 3 and the middle support plate 2, and the width of the circumferential annular groove 6 will become smaller. The elastic ring 7 will be further squeezed and deformed in this process to achieve support for the inner hole of the workpiece.
[0046] According to the workpiece installation standard, after the circular support plate of the support device is assembled with the inner hole of the workpiece, the circular support plate cannot leak out of the surface of the inner hole of the workpiece. In order to allow the elastic ring 7 to generate sufficient extrusion and tensioning force on the inner hole of the workpiece, the position of the circumferential annular groove 6 needs to be as close as possible to the deepest and shallowest positions of the inner hole of the workpiece, so two step circles 4 are provided in this embodiment.
[0047] There may be an embodiment in which a plurality of elastic rings 7 are installed in the circumferential annular groove 6 and the elastic rings 7 are separated by washers. This embodiment is applicable when the workpiece hole depth is particularly shallow and can only accommodate the thickness of one side support plate 3 and one middle support plate 2.
[0048] There may be an embodiment in which the side support plate 3 and the middle support plate 2 include one or more weight-reducing holes 12, and the positions of the weight-reducing holes 12 and the center through hole do not interfere with each other, and the size of the adjustment pad 10 is larger than the size of the center through hole and does not interfere with the positions of the weight-reducing holes 12. The setting of the weight-reducing holes 12 can also provide space for the hand-held device of the utility model, and facilitate the operation when installing with the workpiece. It should be noted that the weight-reducing holes 12 need to be set under the premise of meeting the strength of the circular support plate.
[0049] There may be an embodiment in which at least one of the side support discs 3 has a small outer diameter cylinder for clamping extending outward from the outer end surface thereof and being concentric with the side support disc 3. The middle support disc 2 and the plurality of side support discs 3 are locked together and assembled with the inner hole of the workpiece by a machine tool, and the side support disc 3 is provided with a small outer diameter cylinder for clamping by the machine tool, and the assembly of the circular support disc and the workpiece is achieved by the machine tool.
[0050] There may be an embodiment in which a stepped inner hole 5 concentric with the side support disc 3 is provided on the other side of the side support disc 3. When in use, the stepped circle 4 of one side support disc 3 is assembled into the stepped inner hole 5 of another side support disc 3, and the assembly of multiple side support discs 3 is realized by analogy. The stepped surface 41 of the maximum diameter of one side support disc 3 perpendicular to the axial direction of the circular support disc and the end surface of the side with the stepped inner hole 5 of another side support disc 3 form a circumferential annular groove 6, and an elastic ring 7 is installed in the circular annular groove. In this way, the number of circumferential annular grooves 6 can be increased, that is, the number of elastic rings 7 can be increased, so that sufficient extrusion tension can be generated in the inner hole of the workpiece.
[0051] The actual thickness of the adjustment pad 10 can be determined according to the actual supporting force required by the thin-walled workpiece, that is, after the utility model is locked, the extrusion force of the elastic ring 7 on the inner hole of the workpiece reaches the maximum and keeps the extrusion force consistent.
[0052] Since the force applied during use of the present invention is relatively small, the round support plate is generally made of lightweight materials such as aluminum to reduce the weight of the entire device and facilitate installation and operation; the elastic ring 7 is generally made of elastic materials such as rubber to avoid crushing or scratching the inner hole of the workpiece.
[0053] The support device of the utility model solves the problem of deformation caused by clamping during the processing of high-precision thin-walled workpieces, and is particularly suitable for thin-walled workpieces with a small length-to-diameter ratio of the inner hole size. In addition, it can protect the inner hole surface of the workpiece of low-hardness material to prevent the phenomenon of crushing and scratching the inner hole surface. By selecting the appropriate size of the elastic ring 7 and the width of the circumferential annular groove 6, and adjusting the thickness of the adjustment pad 10, the tensioning and squeezing force can be determined, that is, in actual use, the squeezing force is kept consistent and easy to operate. The device has a compact structure, light weight, economical processing and manufacturing, and strong practicality.
[0054] The above is only a specific implementation of the utility model, which enables those skilled in the art to understand or implement the utility model. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.
Claims
1. A fast tensioning support device, characterized in that: It comprises a middle support plate (2) having a central through hole and at least one side support plate (3); the side support plate (3) and the middle support plate (2) are circular support plates with the same diameter, at least one step circle (4) is provided on one side of the side support plate (3), and a step inner hole (5) concentric with the middle support plate (2) is provided on one side or both side end surfaces of the middle support plate (2), and the diameter of at least one step circle (4) is smaller than the diameter of the step inner hole (5); The side support disk (3) and the middle support disk (2) are locked by a locking mechanism, at least one step circle (4) is assembled into the step inner hole (5) of the middle support disk (2), a step surface (41) of the side support disk (3) perpendicular to the axial direction of the circular support disk and the end surface of the middle support disk (2) form a circumferential annular groove (6), an elastic ring (7) is installed in the circumferential annular groove (6), and the side support disk (3) and the middle support disk (2) are matched with the inner hole of the workpiece with a small gap.
2. A rapid tensioning support device according to claim 1, characterized in that: The side support disk (3) is provided with a central through hole, the locking mechanism comprises a nut (83) and a positioning shaft (9), the positioning shaft (9) comprises a base and a shaft portion, the free end of the shaft portion is provided with a thread, the minimum diameter of the base is larger than the central through hole of the circular support disk, the shaft portion of the positioning shaft (9) is passed through the central through hole of the circular support disk, and the shaft portion of the positioning shaft (9) is fixed by the nut (83).
3. A rapid tensioning support device according to claim 1, characterized in that: It also comprises an adjustment pad (10). When there are a plurality of side support plates (3), the adjustment pad (10) is arranged between the side support plates (3) and the middle support plate (2). The adjustment pad (10) is arranged between the side support plates (3).
4. A rapid tensioning support device according to claim 1, characterized in that: A plurality of elastic rings (7) can be installed in the circumferential annular groove (6), and the elastic rings (7) are separated by gaskets.
5. A rapid tensioning support device according to claim 2, characterized in that: The number of the side support plate (3) is 1, and the number of the step circle is 1.
6. A rapid tensioning support device according to claim 1 or 3, characterized in that: At least one side support disk (3) has a central core shaft (11), and the other side support disks (3) are provided with a central through hole, the free end of the central core shaft (11) has a thread, the central through holes of the other side support disks (3) and the central core shaft (11) are matched with a small clearance, the central through hole of the middle support disk (2) and the central core shaft (11) are matched with a small clearance, and the circular support disk with the central through hole passes through the central core shaft (11) and is fixed with a nut (83).
7. A rapid tensioning support device according to any one of claims 1 to 5, characterized in that: The side support plate (3) and the middle support plate (2) comprise one or more weight-reducing holes (12), and the positions of the weight-reducing holes (12) and the central through hole do not affect each other.
8. A fast tensioning support device according to any one of claims 1 to 5, characterized in that: At least one side support plate (3) has a small outer diameter cylinder extending outwardly from the other side thereof and being concentric with the side support plate (3) and used for clamping.
9. A fast tensioning support device according to any one of claims 1 to 5, characterized in that: A stepped inner hole (5) concentric with the side support plate (3) is provided on the other side of the side support plate (3).
10. A rapid tensioning support device according to claim 5, characterized in that: It also comprises an adjustment pad (10), wherein the adjustment pad (10) is arranged between the side support plate (3) and the middle support plate (2).
11. A rapid tensioning support device according to claim 6, characterized in that: A parallel flat head (13) is provided at the free end of the central core shaft (11).
12. A rapid tensioning support device according to claim 6, characterized in that: The side support plate (3) and the middle support plate (2) include one or more weight-reducing holes (12), and the positions of the weight-reducing holes (12) and the central through hole do not affect each other.
13. A rapid tensioning support device according to claim 11, characterized in that: The side support plate (3) and the middle support plate (2) include one or more weight-reducing holes (12), and the positions of the weight-reducing holes (12) and the central through hole do not affect each other.
14. A rapid tensioning support device according to claim 13, characterized in that: At least one of the side support plates (3) has an outer end surface extending outwardly therefrom and having a small outer diameter cylinder which is concentric with the side support plate (3) and is used for clamping.