Wide-range expanding and clamping device

Abstract

The utility model discloses a wide-range expansion clamping device, which relates to the technical field of work fixtures, and comprises a fixed seat, the fixed seat is fixed on a connecting part of a processing device, a plurality of limiting blocks are arranged at the upper end of the fixed seat, a movable expansion flap is arranged between every two limiting blocks, and the movable expansion flaps and the limiting blocks slide relative to each other. A plurality of contraction springs are arranged on the outer walls of the movable expansion flaps, an upper cover is arranged at the upper ends of the movable expansion flaps, and pull rod cones are arranged in the fixing base and the movable expansion flaps in a sliding mode. By adjusting the matching conicity and the axial length of the movable expansion petals and the pull rod cone, the clamping device can adapt to workpieces in different diameter ranges, the wide-range clamping capacity is achieved, due to the flexibility, the same device can be used for the workpieces in various sizes, the requirement for replacing a clamp is reduced, and the production efficiency and the cost benefit are improved.

Description

Technical Field

[0001] This utility model relates to the field of tooling and fixture technology, specifically a wide-range clamping device. Background Technology

[0002] In industrial manufacturing, especially in applications such as balancing, measurement, and machining, the center hole of a workpiece is often used as a positioning reference for various operations. The center hole plays a crucial role in these processes; as a key reference element, the positional relationships of other hole groups and surface features are often determined with reference to the center hole. Therefore, ensuring the accuracy and stability of the center hole positioning is of great significance for guaranteeing overall machining precision and product quality.

[0003] Currently, the two most commonly used centering methods in industry are the expansion sleeve type and the conical clamp type. However, both methods have some inherent drawbacks. Although the conical clamp type centering method has a simple structure, its positioning accuracy is easily affected by factors such as burrs at the orifice and chamfers, which prevents further improvement in positioning accuracy. Therefore, the conical clamp type centering method is limited in practical applications.

[0004] On the other hand, while the expansion sleeve centering method improves positioning accuracy to some extent, its structural limitations restrict the range of expansion clamp sizes. To accommodate center holes of different sizes, multiple expansion sleeves of different specifications are typically required, which undoubtedly increases management costs related to storage, maintenance, and replacement. Furthermore, with the diversification of workpiece sizes, the limitations of the expansion sleeve centering method become increasingly apparent, making it difficult to meet the growing industrial demands.

[0005] Based on this, a wide-range expansion clamping device is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0006] The purpose of this invention is to provide a wide-range expansion clamping device to solve the problems in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A wide-range clamping device includes a fixed base, which is fixed to a connecting component of a processing device. The upper end of the fixed base is provided with several limiting blocks. A movable expansion flap is provided between every two limiting blocks, and the movable expansion flap slides with the limiting blocks. The outer wall of the movable expansion flap is provided with several contraction springs. The upper end of the movable expansion flap is provided with a top cover. A pull rod cone slides inside the fixed base and the several movable expansion flaps.

[0009] Preferably, the upper end of the limiting block has a countersunk hole, and the upper end of the cover has a plurality of connecting holes. The plurality of connecting holes are distributed in a circle. The upper cover is fixed to the fixing seat by long screws passing through the connecting holes and the countersunk holes of part of the limiting block. The remaining limiting blocks are fixed to the fixing seat by short screws, which are disposed inside the countersunk holes.

[0010] Preferably, the upper end of the fixed base is provided with a plurality of positioning holes I, the limiting block is provided with positioning holes II, and each positioning hole II corresponds to one positioning hole I, and each positioning hole I and positioning hole II is provided with a positioning pin inside.

[0011] Preferably, the movable expansion valve has slots at both the top and bottom, and the plurality of contraction springs are divided into two groups, with at least two contraction springs in each group. The two groups of contraction springs are respectively engaged in the slots at the top and bottom of the outer wall of the movable expansion valve.

[0012] Preferably, the fixed seat is provided with a sliding sleeve, and the tie rod cone is slidably connected to the sliding sleeve.

[0013] Preferably, the tensioning vertebra includes a tensioning vertebra and a tensioning rod, the tensioning vertebra is fixed to the upper end of the tensioning rod, and the tensioning vertebra is slidably connected to the movable expansion valve.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. By adjusting the taper and axial length of the movable expansion valve and the tie rod cone, this utility model can adapt to workpieces with different diameter ranges and achieve a wide range of clamping capabilities. This flexibility allows the same device to be used for workpieces of various sizes, reducing the need to change fixtures and improving production efficiency and cost-effectiveness.

[0016] 2. This utility model ensures the stability and positional accuracy of the movable expansion valve during the tensioning process through the precise cooperation of the limiting block, positioning hole one and positioning hole two, and positioning pin; at the same time, the upper and lower group design of the contraction spring provides uniform contraction force, enhances the stability and reliability of clamping, and avoids damage caused by uneven stress. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a cross-sectional view of the front end of the present invention.

[0019] Figure 3 This utility model Figure 1 A cross-sectional view of the structure at point A-A.

[0020] Figure 4This utility model Figure 3 A cross-sectional view of the structure at point B-B.

[0021] Figure label annotations: 1. Fixed seat; 2. Sliding sleeve; 3. Retraction spring; 4. Tie rod cone; 41. Tensioning cone; 42. Tie rod; 5. Movable expansion flap; 6. Limiting block; 61. Countersunk hole; 7. Short screw; 8. Top cover; 81. Connecting hole; 9. Long screw; 10. Positioning pin. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] In one embodiment, such as Figures 1-4 As shown, a wide-range clamping device includes a fixed base 1, which is fixed to a connecting component of a processing device. The fixed base 1 has several limiting blocks 6 on its upper end. A movable expansion flap 5 is provided between every two limiting blocks 6, and the movable expansion flap 5 slides with the limiting blocks 6. Several contraction springs 3 are provided on the outer wall of the movable expansion flap 5. An upper cover 8 is provided on the upper end of the movable expansion flap 5. A pull rod cone 4 slides inside the fixed base 1 and the several movable expansion flaps 5.

[0024] In this embodiment, the limiting block 6 is used to prevent the movable expansion flap 5 from shifting. The movable expansion flap 5 is forced to expand outward and retract inward by pushing and pulling the pull rod cone 4 and the contraction spring 3 to clamp or release the center hole of the product to be processed.

[0025] In an optional embodiment, the upper end of the limiting block 6 is provided with a countersunk hole 61, and the upper end of the cover 8 is provided with a plurality of connecting holes 81. The plurality of connecting holes 81 are distributed in a circle. The upper cover 8 is fixed to the fixing base 1 by long screws 9 passing through the connecting holes 81 and part of the countersunk holes 61 of the limiting block 6. The remaining limiting blocks 6 are fixed to the fixing base 1 by short screws 7, and the short screws 7 are disposed inside the countersunk holes 61.

[0026] It should be noted that the design of fixing the upper cover 8, the limiting block 6, and the fixing base 1 with long screws 9 and short screws 7 not only ensures the stability and reliability of the clamping device, but also facilitates installation and disassembly, improving work efficiency. For the limiting blocks 6 that are not pierced by the long screws 9, they are connected to the fixing base 1 with short screws 7. These short screws 7 are installed inside the countersunk holes 61, and their function is to provide a fixed position for these limiting blocks 6 before the upper cover 8 and the fixing base 1 are finally fixed with the long screws 9, ensuring that they do not move or misalign during installation.

[0027] In an optional embodiment, the upper end of the fixed base 1 is provided with a plurality of positioning holes 1, the limiting block 6 is provided with positioning holes 2, and each positioning hole 2 corresponds to a positioning hole 1, and each positioning hole 1 and positioning hole 2 is provided with a positioning pin 10 inside.

[0028] It should be noted that positioning the limit block 6 and the fixed base 1 through positioning hole 1, positioning hole 2 and positioning pin 10 facilitates the subsequent assembly of the device by using short screw 7 and long screw 9, ensuring the accuracy of the position of the limit block 6.

[0029] In an optional embodiment, the movable expansion flap 5 has slots at both the top and bottom, and the plurality of contraction springs 3 are divided into two groups, with at least two contraction springs in each group. The two groups of contraction springs 3 are respectively engaged in the slots at the top and bottom of the outer wall of the movable expansion flap 5.

[0030] It should be noted that the slot ensures that the retraction spring 3 can be firmly engaged within it, preventing it from easily falling off or loosening. Furthermore, the retraction spring 3 is divided into two groups, with at least two springs in each group, to achieve uniform contraction force and stability, avoiding damage caused by excessive localized stress.

[0031] In an optional embodiment, a sliding sleeve 2 is provided inside the fixed base 1, and the pull rod cone 4 is slidably connected to the sliding sleeve 2.

[0032] It should be noted that the design of setting a sliding sleeve 2 inside the fixed seat 1 and forming a sliding connection with the pull rod cone 4 is beneficial to improving the working efficiency and clamping performance of the expansion clamping device, and also reduces maintenance costs and ease of use.

[0033] In an optional embodiment, the pull rod vertebra 4 includes a tensioning vertebra 41 and a pull rod 42, the tensioning vertebra 41 being fixed to the upper end of the pull rod 42, and the tensioning vertebra 41 being slidably connected to the movable expansion flap 5.

[0034] It should be noted that the taper and axial length of the movable expansion flap 5 and the tie rod cone 4 can be adjusted according to the obtained diameter range to achieve different diameter coverage. By increasing the taper or axial length of the tie rod cone 4, the expansion clamping device can clamp workpieces with larger diameters, and the stroke of the movable expansion flap 5 can reach 10-20mm and above.

[0035] The above embodiment discloses a wide-range clamping device, wherein, firstly, the stop of the fixed seat 1 is aligned with the shaft head on the machining device. Next, the pull rod cone 4 is connected to the telescopic interface of the machining device. Finally, the fixed seat 1 is tightened and fixed to the machining device using screws.

[0036] When workpiece tensioning is required, press the tension button. The telescopic rod of the machining device responds to the command and retracts downward, causing the tie rod cone 4 to move downward. The conical surface on the tie rod cone 4 pushes multiple movable expansion flaps 5, which are in contact with its circumference, outward. The movable expansion flaps 5 continue to move outward until they are in full contact with the inner hole of the workpiece and stop.

[0037] Under tension, the movable expansion flap 5 is pushed outward by the conical surface of the tie rod cone 4, thus firmly clamping the workpiece.

[0038] When it is necessary to release the workpiece, press the release button. The telescopic rod of the machining device extends upward in response to the command, driving the pull rod cone 4 upward. The conical surface on the pull rod cone 4 gradually moves away from the multiple movable expansion flaps 5 that are in contact with its circumference. After the movable expansion flaps 5 lose their thrust, they begin to move inward due to the clamping action of the external contraction spring 3. The movable expansion flaps 5 continue to move inward until they adhere to the conical surface of the pull rod cone 4 and stop moving. Due to the inward contraction movement of the movable expansion flaps 5, they no longer contact the inner hole of the workpiece, thus achieving release.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A wide-range expansion clamping device, characterized in that, Includes a fixed base (1), which is fixed on the connecting part of the processing device. The fixed base (1) is provided with several limiting blocks (6) at its upper end. A movable expansion flap (5) is provided between every two limiting blocks (6), and the movable expansion flap (5) slides with the limiting block (6). Several contraction springs (3) are provided on the outer wall of the movable expansion flap (5). A top cover (8) is provided on the upper end of the movable expansion flap (5). A pull rod cone (4) slides inside the fixed base (1) and the several movable expansion flaps (5).

2. The wide-range expansion clamping device according to claim 1, characterized in that, The upper end of the limiting block (6) is provided with a countersunk hole (61), and the upper end of the cover (8) is provided with a plurality of connecting holes (81). The plurality of connecting holes (81) are distributed in a circle. The upper cover (8) is fixed to the fixing seat (1) by passing through the connecting holes (81) and the countersunk holes (61) of part of the limiting block (6) with long screws (9). The remaining limiting blocks (6) are fixed to the fixing seat (1) by short screws (7). The short screws (7) are set inside the countersunk holes (61).

3. The wide-range expansion clamping device according to claim 1, characterized in that, The fixed base (1) has several positioning holes 1 on its upper end, and the limiting block (6) has positioning holes 2. Each positioning hole 2 corresponds to a positioning hole 1, and each positioning hole 1 and positioning hole 2 is provided with a positioning pin (10).

4. The wide-range expansion clamping device according to claim 1, characterized in that, The movable expansion valve (5) has slots at both the top and bottom. The retraction springs (3) are divided into two groups, with at least two retraction springs in each group. The two groups of retraction springs (3) are respectively engaged in the slots at the top and bottom of the outer wall of the movable expansion valve (5).

5. A wide-range expansion clamping device according to claim 1, characterized in that, The fixed seat (1) is provided with a sliding sleeve (2), and the pull rod cone (4) is slidably connected to the sliding sleeve (2).

6. A wide-range expansion clamping device according to claim 1, characterized in that, The pull rod vertebra (4) includes a tension vertebra (41) and a pull rod (42). The tension vertebra (41) is fixed to the upper end of the pull rod (42), and the tension vertebra (41) is slidably connected to the movable expansion valve (5).

Images