Cylindrical thin-wall positioning structure and self-centering clamp

Abstract

The utility model provides a cylindrical thin-wall positioning structure and a self-centering clamp, the cylindrical thin-wall positioning structure comprises a base assembly, a shell, a pneumatic lifting assembly and a clamping assembly, the shell is installed on the base assembly, the pneumatic lifting assembly is installed in the shell, and a plurality of inclined protrusions are arranged at one end of the pneumatic lifting assembly in a protruding mode; a chip removal channel is further formed in the center of the shell, the shell is provided with a plurality of movable grooves which are formed at intervals with the chip removal channel as the center, the clamping assembly comprises a plurality of sliding parts and a plurality of clamping parts, the clamping parts are connected to the corresponding sliding parts, sliding chutes are formed in the sliding parts, and each sliding part is arranged in the corresponding movable groove in a sliding mode. Each inclined protrusion is arranged in the corresponding sliding inclined groove in a penetrating mode. The multiple arc grooves jointly form a circular mounting groove and communicate with the chip removal channel. The bottom of the part is clamped through the clamping piece, the contact face of the clamping piece and the part is the arc face, the surface of the part is prevented from being scratched, chips are discharged through the chip discharging channel, and the influence of the chips on the machining process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy parts processing, and in particular to a cylindrical thin-wall positioning structure and a self-centering fixture. Background Art

[0002] Aluminum alloy has high strength, good plasticity, excellent electrical conductivity, thermal conductivity and resistance. After heat treatment, aluminum alloy can obtain good mechanical properties, physical properties and corrosion resistance. The shell of small electrical appliances is a cylindrical thin-walled device. Aluminum alloy parts can greatly improve the strength of the shell parts. Therefore, the shell of small electrical appliances can be made of aluminum alloy into cylindrical thin-walled parts, and the cylindrical thin-walled parts are then drilled by CNC machine tools.

[0003] When processing cylindrical thin-walled parts, the cylindrical thin-walled parts are first clamped on the chuck, and then drilled by the CNC machine. When processing cylindrical thin-walled parts, it is necessary to drill holes at the bottom and process the side walls. When the fixture clamps the parts to drill holes at the bottom, the side walls of the cylindrical thin-walled parts will be blocked. When the fixture is not suitable, the fixture is easy to scratch the surface of the side wall of the part. The processing process of the fixture clamping the cylindrical thin-walled parts will also produce debris, which will affect the processing process of the CNC machine tool on the cylindrical thin-walled parts.

[0004] For example, a pneumatic chuck disclosed in the reference document CN201820651041.0 comprises a circular disc body with a circular through hole in the center, and three linear slide rails are installed on one side surface of the disc body to divide the circular surface of the disc body into three equal parts, and a clamping block for clamping a workpiece is installed on each linear slide rail through a connected slider, and each clamping block is connected to a clamping cylinder, and the clamping cylinder is fixed on the corresponding linear slide rail. The pneumatic chuck of this scheme can conveniently fix the parts by fixing the linear slide rail on the surface of the disc body and the clamping block on the linear slide rail, and directly fixes the cylinder on the linear slide rail, with a compact structure and convenient use. However, this scheme cannot solve the problem that when the fixture clamps the thin-walled parts of the cylinder, the side wall of the part is easily scratched, and the debris generated by processing the thin-walled parts of the cylinder will still affect the processing process of the thin-walled parts of the cylinder by the CNC machine tool. Utility Model Content

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a cylindrical thin-wall positioning structure and a self-centering fixture that are suitable for clamping cylindrical thin-wall parts to avoid scratches by the fixture and to discharge debris.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A cylindrical thin-wall positioning structure includes a base assembly, a shell, a pneumatic lifting assembly and a clamping assembly.

[0008] The shell is mounted on the base assembly, an annular active cavity is provided in the shell, the pneumatic lifting assembly is installed in the annular active cavity, an inclined protrusion is provided at one end of the pneumatic lifting assembly, and an active groove is provided in the shell away from the base assembly, and the active groove is connected to the annular active cavity.

[0009] The clamping assembly includes a sliding member and a clamping member. A chip removal channel is also provided at the center of the shell. The clamping member is provided with an arc groove. The sliding member is provided with a sliding bevel groove. There are multiple sliding members, inclined protrusions, the sliding bevel grooves, the movable grooves and the clamping member. Multiple movable grooves are arranged at intervals along the center of the chip removal channel. Each sliding member is slidably arranged in the corresponding movable groove. Each inclined protrusion is penetrated through a sliding bevel groove. Each clamping member is connected to the corresponding sliding member. Multiple arc grooves together form a circular mounting groove. The circular mounting groove is used to clamp the bottom of a cylindrical part. The chip removal channel is connected to the circular mounting groove.

[0010] In one embodiment, the clamping member has an arc clamping surface, an arc adapting surface and an arc placing surface which are connected in sequence, and the arc adapting surface is a chamfered structure with a curved surface transition.

[0011] In one embodiment, the number of the housing and the number of the pneumatic lifting components are both plural.

[0012] In one embodiment, the pneumatic lifting assembly includes a cylinder and a movable part, the cylinder is installed in the annular movable cavity, the movable part is arranged in the annular movable cavity, the movable part is connected to the output end of the cylinder, and one end of the movable part is protruding with a plurality of the inclined protrusions, and each of the inclined protrusions is movably arranged in the corresponding sliding inclined groove.

[0013] In one embodiment, the base assembly includes a connecting plate, a first fixing member and a mounting plate, the connecting plate is provided with a first connecting hole, the mounting plate is provided with a second connecting hole, the first fixing member is passed through the first connecting hole, one end of the first fixing member abuts against the connecting plate, and the other end of the first fixing member is connected to the second connecting hole.

[0014] In one embodiment, the base assembly also includes a second fixing member, the connecting plate has a first fixing hole, the shell has a second fixing hole, the second fixing member is passed through the second fixing hole, one end of the second fixing member is connected to the second fixing hole, and the other end of the second fixing member is abutted against the first fixing hole.

[0015] In one embodiment, the connection plate is provided with a limiting groove, and the shell is installed in the limiting groove.

[0016] In one of the embodiments, the base assembly further includes a positioning member, and the positioning member is disposed in the limiting groove. The shell further has a positioning groove, and the positioning groove is used to accommodate at least a portion of the positioning member.

[0017] In one of the embodiments, the cylindrical thin-wall positioning structure further includes a side wall mounting member, the side wall mounting member is connected to the end of the mounting plate, and the side wall mounting member is used to connect to a CNC machine tool.

[0018] A self-centering fixture comprises the cylindrical thin-wall positioning structure described in any one of the above embodiments.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] 1. The above-mentioned cylindrical thin-wall positioning structure and self-centering fixture clamp the bottom of the cylindrical thin-walled part through multiple clamping members, so that when the multiple clamping members clamp the cylindrical thin-walled part, the CNC machine tool can drill holes on the bottom and side walls of the cylindrical thin-walled part respectively, thereby improving the processing efficiency of the cylindrical thin-walled part; when the multiple clamping members clamp the cylindrical thin-walled part, the contact surface between the clamping members and the cylindrical thin-walled part is an arc surface, thereby avoiding scratches on the cylindrical thin-walled part, thereby improving the processing quality of the cylindrical thin-walled part;

[0021] 2. The chip removal channel is connected to the circular mounting groove. When the cylindrical thin-walled parts are processed, the generated chips can be discharged through the chip removal channel, reducing the impact of the chips on the drilling process, thereby making the processing of the cylindrical thin-walled parts smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a structural schematic diagram of a cylindrical thin-wall positioning structure according to an embodiment;

[0024] Figure 2 for Figure 1 A cross-sectional view of a cylindrical thin-wall positioning structure shown;

[0025] Figure 3 for Figure 1 An exploded view of the cylindrical thin-wall positioning structure shown;

[0026] Figure 4 for Figure 1A partial exploded view of a cylindrical thin-wall positioning structure shown;

[0027] Figure 5 for Figure 1 Another partial exploded view of the cylindrical thin-wall positioning structure shown. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0032] like Figures 1 to 4 As shown, a cylindrical thin-wall positioning structure 10 of an embodiment of the present disclosure includes a base assembly 100, a shell 200, a pneumatic lifting assembly 300 and a clamping assembly 400. The shell 200 is installed on the base assembly 100. An annular movable cavity 201 is provided in the shell 200. The pneumatic lifting assembly 300 is installed in the annular movable cavity 201. An inclined protrusion 310 is convexly provided at one end of the pneumatic lifting assembly 300. When the output end of the pneumatic lifting assembly 300 moves up and down, the inclined protrusion 310 can be driven to move up and down. A movable groove 202 is provided in the shell 200 away from the base assembly 100, and the movable groove 202 is connected to the annular movable cavity 201.

[0033] Furthermore, the clamping assembly 400 includes a sliding member 410 and a clamping member 420. The center of the housing 200 is also provided with a chip removal channel 203. The clamping member 420 is provided with an arc groove 4201. The sliding member 410 is provided with a sliding inclined groove 4101. The number of the sliding member 410, the inclined protrusion 310, the sliding inclined groove 4101, the movable groove 202 and the clamping member 420 is multiple. The multiple movable grooves 202 are arranged at intervals along the chip removal channel 203 as the center. Each sliding member 410 is slidably arranged in the corresponding movable groove 202. Each inclined protrusion 310 is provided with a circular arc groove 4201. 10 is passed through a sliding inclined groove 4101, and each inclined protrusion 310 is connected to the sliding member 410 when it moves up and down, so that the sliding member 410 slides back and forth along the direction of the movable groove 202; each clamping member 420 is connected to the corresponding sliding member 410, and multiple arc grooves 4201 together form a circular mounting groove 4202. When the clamping member 420 clamps a cylindrical thin-walled part, the contact surface between the clamping member 420 and the cylindrical thin-walled part is an arc surface, and the circular mounting groove 4202 is used to clamp the bottom of the cylindrical part, and the chip removal channel 203 is connected to the circular mounting groove 4202.

[0034] In this embodiment, a cylindrical thin-walled part is placed on the circular mounting groove 4202, and the pneumatic lifting assembly 300 is started. The pneumatic lifting assembly 300 controls the inclined protrusion 310 to rise, and the inclined protrusion 310 abuts against the sliding inclined groove 4101, so that the sliding member 410 slides horizontally along the movable groove 202, and multiple sliding members 410 respectively drive the corresponding clamping members 420 to press against the cylindrical thin-walled part; then the cylindrical thin-walled part is processed by bottom drilling and side wall drilling in sequence through a CNC machine tool. When drilling the bottom, the debris can fall into the avoidance groove 4203 and then enter the chip removal channel 203 for discharge. After the processing is completed, the pneumatic lifting assembly 300 controls the inclined protrusion 310 to descend, and the inclined protrusion 310 drives the sliding member 410 to slide horizontally along the movable groove 202, so that multiple sliding members 410 respectively drive the corresponding clamping members 420 to release the cylindrical thin-walled part.

[0035] The above-mentioned cylindrical thin-walled positioning structure 10 clamps the bottom of the cylindrical thin-walled part through multiple clamping members 420, so that when the multiple clamping members 420 clamp the cylindrical thin-walled part, the CNC machine tool can drill holes on the bottom and side walls of the cylindrical thin-walled part respectively, thereby improving the processing efficiency of the cylindrical thin-walled part. When the multiple clamping members 420 clamp the cylindrical thin-walled part, the contact surface between the clamping members 420 and the cylindrical thin-walled part is an arc surface, thereby avoiding scratches on the cylindrical thin-walled part, thereby improving the processing quality of the cylindrical thin-walled part; the chip removal channel 203 is connected to the circular mounting groove 4202. When the cylindrical thin-walled part is processed, the generated chips can be discharged through the chip removal channel 203, thereby reducing the influence of the chips on the drilling process, thereby making the processing process of the cylindrical thin-walled part smoother.

[0036] like Figure 2 and Figure 3As shown, in one embodiment, the clamping member 420 has an arc clamping surface 421, an arc matching surface 422 and an arc placement surface 423 connected in sequence, and the arc matching surface 422 is a rounded structure of a curved surface transition. In this embodiment, the transition part between the bottom and the side wall of the cylindrical thin-walled part is an arc surface, and the rounded structure of the arc matching surface 422 can adapt to the bottom contour of the cylindrical thin-walled part, so that the clamping member 420 can fit more tightly when clamping the cylindrical thin-walled part, thereby making the cylindrical thin-walled part clamped more firmly.

[0037] like Figure 1 As shown, in one embodiment, there are multiple shells 200 and pneumatic lifting components 300. In this embodiment, the multiple shells 200 are respectively provided with corresponding pneumatic lifting components 300, sliding members 410 and clamping members 420, so that the cylindrical thin-walled positioning structure 10 can be installed with multiple cylindrical thin-walled parts for processing, thereby speeding up the efficiency of batch processing of cylindrical thin-walled parts.

[0038] like Figure 2 and Figure 3 As shown, in one embodiment, the pneumatic lifting assembly 300 includes a cylinder 320 and a movable member 330. The cylinder 320 is installed in the annular movable cavity 201. The movable member 330 is arranged in the annular movable cavity 201. The movable member 330 is connected to the output end of the cylinder 320. One end of the movable member 330 is provided with a plurality of inclined protrusions 310. Each inclined protrusion 310 is movably arranged in a corresponding sliding inclined groove 4101. In this embodiment, the cylinder 320 controls the movable member 330 to lift and lower, so that the axial movement of the movable member 330 is matched with the inclined protrusion 310 in the sliding inclined groove 4101, so that the sliding member 410 is converted into horizontal sliding along the movable groove 202, so that the clamping member 420 clamps the cylindrical thin-walled part in the horizontal direction.

[0039] like Figure 2As shown, in one embodiment, the base assembly 100 includes a connecting plate 110, a first fixing member 120 and a mounting plate 130, the connecting plate 110 is provided with a first connecting hole 1101, the mounting plate 130 is provided with a second connecting hole 1301, the first fixing member 120 is passed through the first connecting hole 1101, one end of the first fixing member 120 abuts against the connecting plate 110, and the other end of the first fixing member 120 is connected to the second connecting hole 1301. In this embodiment, the first fixing member 120 can fix the connecting plate 110 on the mounting plate 130. When the shell 200, the pneumatic lifting assembly 300 and the clamping assembly 400 are damaged, the old connecting plate 110 can be disassembled, the old connecting plate 110, the pneumatic lifting assembly 300 and the clamping assembly 400 can be repaired, and the new connecting plate 110, the shell 200, the pneumatic lifting assembly 300 and the clamping assembly 400 can be directly installed on the mounting plate 130, thereby speeding up the replacement speed and avoiding wasting the processing time of cylindrical thin-walled parts.

[0040] like Figure 4 and Figure 5 As shown, in one embodiment, the base assembly 100 further includes a second fixing member 140, the connecting plate 110 is provided with a first fixing hole 1102, the housing 200 is provided with a second fixing hole 204, the second fixing member 140 is passed through the second fixing hole 204, one end of the second fixing member 140 is connected to the second fixing hole 204, and the other end of the second fixing member 140 is abutted against the first fixing hole 1102. In this embodiment, the second fixing member 140 can further fix the connecting plate 110 and the housing 200, so that the connection strength between the connecting plate 110 and the housing 200 is improved, so that the clamping member 420 on the housing 200 can clamp the cylindrical thin-walled parts stably, thereby improving the processing quality of the cylindrical thin-walled parts processed by the CNC machine tool.

[0041] like Figure 5 As shown, in one embodiment, the connection plate 110 is provided with a limiting groove 1103, and the housing 200 is installed in the limiting groove 1103. In this embodiment, the limiting groove 1103 is set at a fixed position, which is convenient for operators to install the housing 200, so that the installation position of the housing 200 is fixed, so that the clamping member 420 on the housing 200 clamps the cylindrical thin-walled part in a fixed position, thereby facilitating the positioning and processing of the cylindrical thin-walled parts by the machine tool.

[0042] like Figure 4 and Figure 5As shown, in one embodiment, the base assembly 100 further includes a positioning member 150, which is disposed in the limiting groove 1103, and the housing 200 further includes a positioning groove 205, which is used to accommodate at least part of the positioning member 150. In this embodiment, the positioning member 150 is adapted to be embedded in the positioning groove 205, and the housing 200 is fixed by the positioning member 150 when it is installed in the limiting groove 1103, so that the position of the housing 200 is fixed, and the shaking of the housing 200 during the installation process is reduced, thereby facilitating the operator to install the housing 200 on the connecting plate 110.

[0043] like Figure 1 As shown, in one embodiment, the cylindrical thin-wall positioning structure 10 further includes a side wall mounting member 500, which is connected to the end of the mounting plate 130, and the side wall mounting member 500 is used to connect to a CNC machine tool. In this embodiment, the side wall mounting member 500 can be connected to the CNC machine tool so that the mounting plate 130 is suspended in the air, and the position of the side wall mounting member 500 can be adjusted to control the distance between the CNC machine tool and the clamped cylindrical thin-walled part, thereby facilitating the CNC machine tool to process the cylindrical thin-walled part.

[0044] The present application also provides a self-centering fixture, including the cylindrical thin-walled positioning structure 10 in any of the above embodiments. In this embodiment, the contact surface between the clamping member and the cylindrical thin-walled part is an arc surface, thereby preventing the cylindrical thin-walled part from being scratched. The bottom of the cylindrical thin-walled part is clamped by multiple clamping members 420, and the side wall of the cylindrical thin-walled part can also be processed when drilling a hole in the bottom of the cylindrical thin-walled part, thereby improving the processing speed of the cylindrical thin-walled part.

[0045] Compared with the prior art, the present invention has at least the following advantages:

[0046] 1. The cylindrical thin-walled positioning structure 10 and the self-centering fixture clamp the bottom of the cylindrical thin-walled part through multiple clamping members 420, so that when the multiple clamping members 420 clamp the cylindrical thin-walled part, the CNC machine tool can drill holes on the bottom and side walls of the cylindrical thin-walled part respectively, thereby improving the processing efficiency of the cylindrical thin-walled part. When the multiple clamping members 420 clamp the cylindrical thin-walled part, the contact surface between the clamping members 420 and the cylindrical thin-walled part is an arc surface, thereby avoiding scratches on the cylindrical thin-walled part, thereby improving the processing quality of the cylindrical thin-walled part.

[0047] 2. The chip removal channel 203 is connected to the circular mounting groove 4202. When the cylindrical thin-walled parts are processed, the generated chips can be discharged through the chip removal channel 203, reducing the impact of the chips on the drilling process, thereby making the processing of the cylindrical thin-walled parts smoother.

[0048] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A cylindrical thin-wall positioning structure, comprising a base assembly, a shell, a pneumatic lifting assembly and a clamping assembly, wherein the shell is mounted on the base assembly, an annular active cavity is provided in the shell, the pneumatic lifting assembly is installed in the annular active cavity, an inclined protrusion is provided at one end of the pneumatic lifting assembly, the shell is provided with an active groove away from the base assembly, the active groove is connected to the annular active cavity, characterized in that: The clamping assembly includes a sliding member and a clamping member. A chip removal channel is also provided at the center of the shell. The clamping member is provided with an arc groove. The sliding member is provided with a sliding bevel groove. There are multiple sliding members, inclined protrusions, the sliding bevel grooves, the movable grooves and the clamping member. Multiple movable grooves are arranged at intervals along the center of the chip removal channel. Each sliding member is slidably arranged in the corresponding movable groove. Each inclined protrusion is penetrated through a sliding bevel groove. Each clamping member is connected to the corresponding sliding member. Multiple arc grooves together form a circular mounting groove. The circular mounting groove is used to clamp the bottom of a cylindrical part. The chip removal channel is connected to the circular mounting groove.

2. The cylindrical thin-wall positioning structure according to claim 1, characterized in that: The clamping member comprises an arc clamping surface, an arc matching surface and an arc placing surface which are connected in sequence, and the arc matching surface is a chamfered structure with curved surface transition.

3. The cylindrical thin-wall positioning structure according to claim 1, characterized in that: The number of the housing and the number of the pneumatic lifting components are both multiple.

4. The cylindrical thin-wall positioning structure according to claim 1, characterized in that: The pneumatic lifting assembly includes a cylinder and a movable part. The cylinder is installed in the annular movable cavity. The movable part is arranged in the annular movable cavity. The movable part is connected to the output end of the cylinder. One end of the movable part is convexly provided with a plurality of inclined protrusions, and each inclined protrusion is movably arranged in the corresponding sliding inclined groove.

5. The cylindrical thin-wall positioning structure according to claim 1, characterized in that: The base assembly includes a connecting plate, a first fixing member and a mounting plate, the connecting plate is provided with a first connecting hole, the mounting plate is provided with a second connecting hole, the first fixing member is passed through the first connecting hole, one end of the first fixing member abuts against the connecting plate, and the other end of the first fixing member is connected to the second connecting hole.

6. The cylindrical thin-wall positioning structure according to claim 5, characterized in that: The base assembly also includes a second fixing member, the connecting plate is provided with a first fixing hole, the shell is provided with a second fixing hole, the second fixing member is passed through the second fixing hole, one end of the second fixing member is connected to the second fixing hole, and the other end of the second fixing member abuts against the first fixing hole.

7. The cylindrical thin-wall positioning structure according to claim 5, characterized in that: The connecting plate is provided with a limiting groove, and the housing is installed in the limiting groove.

8. The cylindrical thin-wall positioning structure according to claim 7, characterized in that: The base assembly further includes a positioning member, which is disposed in the limiting groove. The shell is further provided with a positioning groove, which is used to accommodate at least a portion of the positioning member.

9. The cylindrical thin-wall positioning structure according to claim 6, characterized in that: The cylindrical thin-wall positioning structure also includes a side wall mounting member, which is connected to the end of the mounting plate and is used to connect to a CNC machine tool.

10. A self-centering fixture, characterized in that: The invention comprises the cylindrical thin-wall positioning structure as claimed in any one of claims 1 to 9.

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