Large-diameter thin-wall part clamping device

Abstract

The invention relates to the technical field of clamping, and provides a large-diameter thin-wall part clamping device which is characterized in that a plurality of sliding rods capable of horizontally sliding in a lower mounting ring are arranged, pressing inclined iron is arranged at the inner ends of the sliding rods, and a push-down oil cylinder drives a thrust inclined block to press down to be in contact with the inclined surface of the pressing inclined iron to press down the pressing inclined iron; the pressing inclined iron moves inwards to press the workpiece, the outer end of the pressing inclined iron returns the sliding rod through the return mechanism, the sliding rod always returns through the return mechanism, in this way, pressing force on the workpiece is not too large, damage to the workpiece due to instant impact of pressing is avoided, and the workpiece cannot be scratched by pushing the oil cylinder downwards. The twelve pressing inclined irons and the twelve thrust inclined blocks are arranged, every four pressing inclined irons and the twelve thrust inclined blocks form a group, the pressing inclined irons and the thrust inclined blocks are arranged in an equilateral triangle mode, the number of pressing points for workpieces is large, the workpieces are scattered, and it is guaranteed that the workpieces cannot deform while being pressed.

Description

Technical Field

[0001] The invention relates to the field of clamping technology, and in particular to a clamping device for large-diameter thin-walled parts. Background Art

[0002] A large-diameter thin-walled sleeve workpiece is deformed by a large-tonnage hydraulic press. The mold installed on the hydraulic press needs to be reliably positioned and radially locked during the pressing process of the workpiece. Improper positioning leads to unstable deformation of the work center. If a three-point clamping method is used, there are fewer clamping points, and the clamping force must be increased, but the workpiece is greatly deformed. The prior art CN101214620B discloses a thin-walled sleeve positioning clamping device, which clamps on the outside of the part and has an expansion mechanism on the inside of the part. When clamping, the clamping force on the outside and the expansion force on the inside offset each other, so that the part is not subjected to a large clamping force, is not easy to deform, and ensures the stability of the part clamping. However, for large-diameter thin-walled parts, large thin-walled parts are more easily deformed, and it is difficult to set an expansion mechanism on the inside, and it is also impossible to ensure that it is not easy to deform. A clamping device suitable for large-diameter thin-walled parts is needed. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a clamping device for large-diameter thin-walled parts to solve the problem that large thin-walled parts are more easily deformed, it is difficult to set an expansion mechanism on the inner side thereof, and it is impossible to ensure that they are not easily deformed.

[0004] Based on the above-mentioned purpose, the present invention provides a large-diameter thin-walled parts clamping device, including a workbench, a lower mounting ring is arranged on the top of the workbench, an upper mounting ring is arranged on the top of the lower mounting ring, a plurality of push-down cylinders are arranged in an annular manner on the top of the upper mounting ring, a plurality of sliding rods are arranged in an annular manner inside the lower mounting ring, a clamping oblique iron is arranged at the inner end of the sliding rod, the sliding rod and the clamping oblique iron horizontally penetrate the lower mounting ring and slide with it; the bottom output end of the push-down cylinder penetrates the upper mounting ring and the lower mounting ring and is connected with a thrust oblique block, the thrust oblique block vertically penetrates the lower mounting ring and slides with it, the thrust oblique blocks arranged in an annular manner are arranged one by one above and below the clamping oblique iron arranged in an annular manner, an inclined surface is arranged on the outer side of the clamping oblique iron, and a inclined surface matching the inclined surface of the clamping oblique iron is arranged at the bottom end of the thrust oblique block; a return mechanism is arranged at the outer end of the sliding rod; a positioning cylinder is arranged inside the lower mounting ring, and a positioning pressure block is connected to the inner output end of the positioning cylinder, and the positioning pressure block horizontally penetrates the lower mounting ring and slides with it.

[0005] Preferably, the return mechanism includes a return sleeve fixed to the outside of the lower mounting ring, the sliding rod is inserted in the return sleeve, a limiting bolt is provided at the outer end of the sliding rod, and a return spring is provided on the outer portion of the sliding rod located in the return sleeve, and the return spring is located between the limiting bolt and the outside of the lower mounting ring.

[0006] Preferably, when the return spring is in a retracted state, the clamping bevel iron is located inside the lower mounting ring; when the thrust bevel block moves downward to move the clamping bevel iron inward, the return spring is in a stretched state.

[0007] Preferably, two positioning blocks are further arranged inside the lower mounting ring, and the two positioning blocks and the positioning pressing block form an equilateral triangle arrangement.

[0008] Preferably, there are twelve clamping bevel irons, and each group of four of the twelve are located on the sides of an equilateral triangle formed by two positioning blocks and a positioning pressure block; there are also twelve thrust bevel blocks arranged correspondingly to the clamping bevel irons above and below.

[0009] Preferably, an annular lower mounting plate is provided on the outer side of the top of the lower mounting ring, and a cylinder oil distributor block is provided on the top of the lower mounting plate. The cylinder oil distributor block is provided with oil inlet interfaces and oil outlet interfaces corresponding to multiple push-down cylinders. The push-down cylinder has an oil inlet and an oil outlet, and the oil inlet is connected to the oil inlet interface through a pipeline, and the oil outlet is connected to the oil outlet interface through a pipeline.

[0010] Preferably, all of the push-down cylinders are provided with an annular upper mounting plate at the top, three lifting rings arranged in an equilateral triangle are provided on the top of the upper mounting plate, and a connecting column is provided at the bottom of the lifting ring, which passes through the interior of the upper mounting ring and is connected to the lower mounting ring.

[0011] Preferably, wheel grooves are provided at the four corners of the bottom of the workbench, and rollers are rotatably arranged in the wheel grooves.

[0012] Beneficial effects of the present invention: The present invention uses a plurality of sliding rods that can slide horizontally in the lower mounting ring, and a clamping bevel iron is set at the inner end of the sliding rod. The push-down oil cylinder drives the thrust bevel block to press down and contact the inclined surface of the clamping bevel iron to press the clamping bevel iron down. Due to the effect of the inclined surface, the clamping bevel iron moves inward to clamp the workpiece, and the outer end returns the sliding rod through the return mechanism. The sliding rod always has a return mechanism to return, so that the clamping force on the workpiece will not be too large, and the workpiece will not be damaged by the impact at the moment of clamping, and the push-down oil cylinder will not scratch the workpiece. The present invention drives the positioning block to move inward by the positioning oil cylinder to position the workpiece, ensuring accurate position. The present invention also sets two positioning blocks and the positioning block to form an equilateral triangle arrangement, so that the triangle positioning is more accurate. The present invention sets twelve clamping bevel irons and twelve thrust bevel blocks, which are divided into four groups and arranged in an equilateral triangle. The clamping points on the workpiece are many and dispersed, ensuring that the workpiece will not be deformed while being clamped. The return mechanism of the present invention is provided with a return spring through the outer cover of the sliding rod, and the return spring is between the limit bolt and the lower mounting ring. In this way, as long as the sliding rod moves inward, the return spring is in tension, and the return spring always has a force to pull the sliding rod outward, thereby ensuring that the clamping force is not too large and avoiding impact. The oil cylinder oil distributor of the present invention is connected to the hydraulic pump, and the oil inlet and oil outlet of the push-down cylinder are connected through the oil inlet interface and the oil outlet interface, so that the push-down cylinder is controlled uniformly. The present invention is also provided with three lifting rings, and the lifting rings are connected to the lower mounting ring for stable lifting. Rollers are also provided at the bottom of the workbench of the present invention for easy movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present invention 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, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is an enlarged schematic diagram of the lower mounting ring and the upper mounting ring of the present invention; Figure 3 It is a schematic diagram of the push-down oil cylinder and the sliding rod of the present invention; Figure 4 It is a schematic diagram of the cooperation between the pressing inclined iron and the thrust inclined block without the return sleeve of the present invention.

[0015] The markings in the figure are: 1-workbench, 2-lower mounting ring, 3-upper mounting ring, 4-pushing cylinder, 5-sliding rod, 6-pressing inclined iron, 7-thrust inclined block, 8-positioning cylinder, 9-positioning pressure block, 10-return sleeve, 11-limiting bolt, 12-return spring, 13-positioning block, 14-lower mounting plate, 15-cylinder oil distributor, 16-oil inlet interface, 17-oil outlet interface, 18-upper mounting plate, 19-lifting ring, 20-wheel groove, 21-roller. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0017] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] like Figures 1 to 4As shown, a large-diameter thin-walled parts clamping device includes a workbench 1, a lower mounting ring 2 is arranged on the top of the workbench 1, an upper mounting ring 3 is arranged on the top of the lower mounting ring 2, a plurality of push-down cylinders 4 are arranged in a ring on the top of the upper mounting ring 3, a plurality of sliding rods 5 are arranged in a ring inside the lower mounting ring 2, a clamping bevel iron 6 is arranged at the inner end of the sliding rod 5, the sliding rod 5 and the clamping bevel iron 6 horizontally penetrate the lower mounting ring 2 and slide with it; the bottom output end of the push-down cylinder 4 penetrates the upper mounting ring 3 and the lower mounting ring 2 and is connected with a thrust bevel block 7, the thrust bevel block 7 vertically penetrates the lower mounting ring 2 and slides with it, the thrust bevel blocks 7 arranged in a ring are arranged one by one with the clamping bevel iron 6 arranged in a ring, the outer side of the clamping bevel iron 6 is provided with an inclined surface, and the bottom end of the thrust bevel block 7 is provided with an inclined surface matching the inclined surface of the clamping bevel iron 6; the outer end of the sliding rod 5 is provided with a return mechanism. Through multiple sliding rods 5 that can slide horizontally in the lower mounting ring 2, a clamping bevel iron 6 is arranged at the inner end of the sliding rod 5, and the thrust bevel block 7 is driven by the push-down cylinder 4 to press down and contact the inclined surface of the clamping bevel iron 6 to press the clamping bevel iron 6 down. Due to the action of the inclined surface, the clamping bevel iron 6 moves inward to clamp the workpiece, and the outer end returns the sliding rod through a return mechanism. The sliding rod 5 always has a return mechanism to return, so that the clamping force on the workpiece will not be too large, and the workpiece will not be damaged by the impact at the moment of clamping, and the push-down cylinder 4 will not scratch the workpiece.

[0019] A positioning oil cylinder 8 is provided inside the lower mounting ring 2, and a positioning pressure block 9 is connected to the output end inside the positioning oil cylinder 8. The positioning pressure block 9 horizontally penetrates the lower mounting ring 2 and slides with it. Two positioning blocks 13 are also provided inside the lower mounting ring 2, and the two positioning blocks 13 and the positioning pressure block 9 form an equilateral triangle arrangement. The present invention positions the workpiece by driving the positioning pressure block 9 to move inward by the positioning oil cylinder 8 to ensure accurate position. Two positioning blocks 13 are also provided to form an equilateral triangle arrangement together with the positioning pressure block 9, so that the triangular positioning makes the position more accurate.

[0020] The return mechanism includes a return sleeve 10 fixed on the outer side of the lower mounting ring 2, the sliding rod 5 is inserted into the return sleeve 10, a limit bolt 11 is arranged on the outer end of the sliding rod 5, and a return spring 12 is arranged on the outer portion of the sliding rod 5 located in the return sleeve 10, and the return spring 12 is located between the limit bolt 11 and the outer side of the lower mounting ring 2. When the return spring 12 is in the retracted state, the clamping bevel iron 6 is located inside the lower mounting ring 2; when the thrust bevel block 7 moves downward to move the clamping bevel iron 6 inward, the return spring 12 is in a stretched state. The return mechanism is provided with a return spring 12 on the outer side of the sliding rod 5, and the return spring 12 is between the limit bolt 11 and the lower mounting ring 2. In this way, as long as the sliding rod 5 moves inward, the return spring 12 is in a stretched state, and the return spring 12 always has a force to pull the sliding rod 5 outward, so as to ensure that the clamping force is not too large and to avoid impact.

[0021] There are twelve clamping oblique irons 6, and each of the twelve is a group of four and is located on the sides of an equilateral triangle formed by two positioning blocks 13 and positioning pressing blocks 9; there are twelve thrust oblique blocks 7, which are arranged in correspondence with the clamping oblique irons 6. Twelve clamping oblique irons 6 and twelve thrust oblique blocks 7 are arranged in an equilateral triangle, and the clamping points on the workpiece are numerous and dispersed, ensuring that the workpiece will not be deformed while being clamped.

[0022] Preferably, an annular lower mounting plate 14 is provided on the outer side of the top of the lower mounting ring 2, and an oil cylinder oil distributor 15 is provided on the top of the lower mounting plate 14. The oil cylinder oil distributor 15 is provided with oil inlet interfaces 16 and oil outlet interfaces 17 corresponding to multiple push-down oil cylinders 4. The push-down oil cylinder 4 has an oil inlet and an oil outlet, and the oil inlet is connected to the oil inlet interface 16 through a pipeline, and the oil outlet is connected to the oil outlet interface 17 through a pipeline. The oil cylinder oil distributor 15 is connected to the hydraulic pump, and the oil inlet and oil outlet of the push-down oil cylinder 4 are connected through the oil inlet interface 16 and the oil outlet interface 17, so that the push-down oil cylinder 4 is uniformly controlled.

[0023] Preferably, all of the push-down cylinders 4 are provided with an annular upper mounting plate 18 at the top, and three lifting rings 19 arranged in an equilateral triangle are provided at the top of the upper mounting plate 18. A connecting column is provided at the bottom of the lifting ring 19, and the connecting column passes through the interior of the upper mounting ring 3 and is connected to the lower mounting ring 2. Three lifting rings 19 are also provided, and the lifting rings 18 are connected to the lower mounting ring 2 to facilitate stable lifting.

[0024] Preferably, wheel grooves 20 are provided at the four corners of the bottom of the workbench 1, and rollers 21 are rotatably arranged in the wheel grooves 20 to facilitate movement.

[0025] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A clamping device for large-diameter thin-walled parts, comprising a workbench (1), characterized in that: The workbench (1) is provided with a lower mounting ring (2) on the top, an upper mounting ring (3) on the top of the lower mounting ring (2), a plurality of push-down cylinders (4) are arranged in a ring on the top of the upper mounting ring (3), a plurality of slide rods (5) are arranged in a ring inside the lower mounting ring (2), a clamping bevel iron (6) is arranged at the inner end of the slide rod (5), the slide rod (5) and the clamping bevel iron (6) horizontally penetrate the lower mounting ring (2) and slide with it; the bottom output end of the push-down cylinder (4) penetrates the upper mounting ring (3) and the lower mounting ring (2) and is connected to a thrust bevel block (7), the thrust bevel block (7) vertically penetrates the lower mounting ring (2) and slides with it, the annularly arranged thrust inclined blocks (7) and the annularly arranged pressing inclined irons (6) are arranged one by one up and down, the outer side of the pressing inclined iron (6) is provided with an inclined surface, and the bottom end of the thrust inclined block (7) is provided with an inclined surface that cooperates with the inclined surface of the pressing inclined iron (6); the outer end of the sliding rod (5) is provided with a return mechanism; a positioning cylinder (8) is provided inside the lower mounting ring (2), and the inner output end of the positioning cylinder (8) is connected to a positioning pressing block (9), and the positioning pressing block (9) horizontally penetrates the lower mounting ring (2) and slides with it.

2. A large diameter thin-walled parts clamping device according to claim 1, characterized in that: The return mechanism comprises a return sleeve (10) fixed to the outer side of the lower mounting ring (2), the sliding rod (5) is inserted into the return sleeve (10), a limit bolt (11) is arranged at the outer end of the sliding rod (5), a return spring (12) is arranged on the outer portion of the sliding rod (5) located inside the return sleeve (10), and the return spring (12) is located between the limit bolt (11) and the outer side of the lower mounting ring (2).

3. A large diameter thin-walled parts clamping device according to claim 2, characterized in that: When the return spring (12) is in a retracted state, the clamping bevel iron (6) is located inside the lower mounting ring (2); when the thrust bevel block (7) moves downward to move the clamping bevel iron (6) inward, the return spring (12) is in a stretched state.

4. A large diameter thin-walled parts clamping device according to claim 1, characterized in that: Two positioning blocks (13) are also arranged inside the lower mounting ring (2), and the two positioning blocks (13) and the positioning pressing block (9) form an equilateral triangle arrangement.

5. A large diameter thin-walled parts clamping device according to claim 4, characterized in that: There are twelve clamping oblique irons (6), and each of the twelve is a group of four and is located on the sides of an equilateral triangle formed by two positioning blocks (13) and a positioning pressure block (9); there are twelve thrust oblique blocks (7) which are arranged correspondingly above and below the clamping oblique irons (6).

6. A large diameter thin-walled parts clamping device according to claim 1, characterized in that: An annular lower mounting plate (14) is arranged on the outer side of the top end of the lower mounting ring (2), and an oil cylinder oil distributor (15) is arranged on the top of the lower mounting plate (14). The oil cylinder oil distributor (15) is provided with oil inlet interfaces (16) and oil outlet interfaces (17) corresponding to a plurality of push-down oil cylinders (4). The push-down oil cylinder (4) has an oil inlet and an oil outlet, the oil inlet is connected to the oil inlet interface (16) through a pipeline, and the oil outlet is connected to the oil outlet interface (17) through a pipeline.

7. A large diameter thin-walled parts clamping device according to claim 1, characterized in that: A circular upper mounting plate (18) is commonly provided at the top of all the push-down cylinders (4), three lifting rings (19) arranged in an equilateral triangle are provided at the top of the upper mounting plate (18), a connecting column is provided at the bottom of the lifting ring (19), and the connecting column passes through the interior of the upper mounting ring (3) and is connected to the lower mounting ring (2).

8. A large diameter thin-walled parts clamping device according to claim 1, characterized in that: Wheel grooves (20) are provided at four corners of the bottom of the workbench (1), and rollers (21) are rotatably arranged in the wheel grooves (20).

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