Sleeve-type workpiece travel fixture for flexible automated electrical machining production line

Abstract

The present invention proposes a sleeve-type workpiece accompanying fixture for a flexible automated electrical machining production line, including a clamping body, a base, an end face positioning flange, an expansion sleeve, a core shaft and other components. A push-pull ring, a push-pull sleeve, an elastic member and a linear drive mechanism are provided in the clamping body and the end face positioning flange to drive the expansion sleeve to slide along the axis direction of the clamping body. The push-pull sleeve, the push-pull ring, the core shaft and the expansion sleeve are coaxially connected in the axis direction of the clamping body; the elastic member drives the push-pull sleeve and the expansion sleeve to slide backward, and the expansion sleeve expands radially with the core shaft when sliding backward to position and clamp the workpiece; the push-pull sleeve and the expansion sleeve are driven to slide forward by the linear drive mechanism, and the expansion sleeve contracts radially to release the workpiece when moving forward. This solution has the advantages of high positioning and clamping accuracy, automatic loading and unloading of workpieces, small size, light weight, low cost, and rust prevention, and meets the requirements of flexible automatic online transmission with electrical machining machine tools as the main body.

Description

Technical Field

[0001] The invention relates to the technical field of electrical machining, and in particular to a sleeve-type workpiece traveling fixture for a flexible automated electrical machining production line. Background Art

[0002] In the flexible automated electro-machining production line, electro-machining machine tools are needed to process sleeve parts of multiple specifications and small batches, such as precision sleeve parts such as valve sleeves and valve bodies of hydraulic valves. In the production process of such sleeve parts flexible automatic lines, a traveling fixture is needed. The traveling fixture is required to have a standardized, high-precision zero-point positioning automatic loading and unloading mechanical interface, and to be able to accurately, reliably and high-precision transfer between various equipment on the automatic line (inside and outside the line). At the same time, it is required to be able to perform high-precision positioning, clamping, and automatic loading and unloading of the workpiece.

[0003] On June 3, 2015, Chinese patent CN104668593A announced and authorized a utility model patent with patent number 2013106200882, named "Expansion sleeve type thin-walled outer sleeve clamping tool" (hereinafter referred to as "comparative document 1"). The patent discloses an expansion sleeve type thin-walled outer sleeve clamping tool, which is provided with a clamp body 1, a tensioning plug 2, a tensioning spring 3 and a clamping bolt 4. The clamp body 1 is composed of a positioning plate, a clamping sleeve and a tensioning sleeve. One end of the positioning plate is fixedly connected to the tensioning sleeve, and the other end is fixedly connected to the clamping sleeve. After analysis and research, the workpiece of the patent is positioned by a positioning plate integrated with the clamp body. After the workpiece is placed in the tensioning sleeve, the tensioning plug moves toward the tensioning sleeve to expand the tensioning sleeve, so that the workpiece is clamped and positioned. However, the clamping plug has no precise guide. When the clamping screw pushes the clamping plug, the contact end faces of the clamping screw and the clamping plug will jump, and the clamping plug will deflect, resulting in uneven circumferential deformation of the clamping sleeve, making it impossible to position the inner hole of the workpiece with high precision. At the same time, the clamp achieves workpiece clamping through manual operation and cannot meet the requirements of automation.

[0004] In order to overcome the above positioning precision problems and enable it to be applied to automated production lines, the existing market also provides standard precision expansion sleeve workpiece automatic positioning clamping and replacement fixtures. However, such fixtures require a large clamping force due to the use of large cutting forces such as turning and milling. Not only are the size and weight of the fixtures large and cannot be rust-proof, but the zero-point positioning system of the fixture exchange is also inconsistent with the zero-point positioning system of other tools such as electrodes exchanged in the line, and the fixture is expensive. Considering that when the EDM machine tool processes precision sleeve parts such as valve sleeves and valve bodies similar to hydraulic valves, there is no cutting force on the workpiece itself and the clamping force requirement is small. The processing environment of the EDM machine tool itself requires the use of water-based working fluid to play the role of deionization, cooling, and removing electro-erosion products. Therefore, there are certain requirements for the anti-rust function of the fixture itself. At the same time, in EDM, the working space of the EDM machine tool and the cost of the fixture itself must be considered, and the convenience and reliability requirements when transmitting on the flexible automatic production line with the EDM machine tool as the main body must also be considered. It is obvious that the standard precision expansion sleeve workpiece automatic positioning, clamping and replacement fixtures currently available on the market cannot meet the needs of accompanying fixtures for transmission on flexible automatic production lines with EDM machines as the main body. They are large in size and weight. When used on flexible automatic production lines, it may be necessary to modify the EDM machine tool components and transmission devices for applicability, with a long modification cycle and high cost. They are not rust-proof and cannot be used in EDM environments with water-based working fluids. The cost of rust prevention is too high, and their size and weight may be increased again. When the fixture is exchanged inside or outside the line, the zero-point positioning system of the existing fixture is inconsistent with the zero-point positioning system of other tools such as electrodes exchanged inside the line, which causes trouble for the transmission of materials inside the line.

[0005] Therefore, how to solve the problems of conventional sleeve-type tensioning clamps in the prior art that their positioning accuracy does not meet the standards, as well as the problems of large size, heavy weight, no rust prevention, and inconsistency between the zero-point positioning system and the zero-point positioning system of other tools such as electrodes exchanged in the line using the existing standard precision expansion sleeve workpiece automatic positioning clamping and replacement clamps, has become the subject to be studied and solved by the present invention. Summary of the invention

[0006] The present invention provides a sleeve-type workpiece accompanying fixture for a flexible automated electrical machining production line, with the purpose of solving the problems that the conventional sleeve-type tensioning fixtures in the prior art do not meet the positioning accuracy standards, as well as the problems that the existing standard precision expansion sleeve workpiece automatic positioning clamping and replacement fixtures are large in size, heavy in weight, cannot be rust-proof, and the zero-point positioning system is inconsistent with the zero-point positioning system of other tools such as electrodes exchanged in the line, so as to meet the needs of being used as a high-precision accompanying fixture in a flexible automatic production line with electrical machining machine tools as the main body. The accompanying fixture is not only highly accurate in transmission on the automatic line, but also more convenient and reliable. The fixture itself and the workpiece can be automatically loaded, unloaded and transmitted. The fixture also has the advantage of being cheaper and less expensive to use in batches.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a sleeve-type workpiece accompanying fixture for a flexible automated electrical machining production line, comprising a clamp body, a base, an end face positioning flange, an expansion sleeve, a mandrel, a push-pull sleeve, a push-pull ring, an elastic body, a rivet, a zero point positioning sheet and a support foot;

[0008] The clamp body is a cylindrical structure, and has a containing cavity arranged front and back along the axis direction of the clamp body;

[0009] The base is fixed to the rear end of the clamping body, and the base realizes accurate zero-point positioning and automatic connection or disconnection with the external automatic clamping disc in the X, Y, and Z directions, and is used for zero-point positioning of the mechanical interface;

[0010] The end surface positioning flange is fixed to the front end of the clamp body, and the end surface positioning flange has an opening;

[0011] The expansion sleeve is inserted into the opening of the end face positioning flange, and has a tapered inner hole, the axis of the tapered inner hole is consistent with the axis direction of the clamp body, and the diameter of the tapered inner hole gradually increases from the front end to the rear end;

[0012] The front end of the mandrel has a cone, and the diameter of the cone gradually increases from the front end to the rear end;

[0013] The front end surface of the end face positioning flange is the positioning end surface, which is perpendicular to the axis direction of the clamp body. A push-pull ring, a push-pull sleeve, an elastic member and a linear drive mechanism are arranged in the clamp body and the end face positioning flange to drive the expansion sleeve to slide along the axis direction of the clamp body.

[0014] The front end of the expansion sleeve is located on the front side of the end surface positioning flange opening, and the rear end of the expansion sleeve is located on the rear side of the end surface positioning flange opening. The outer circumferential surface of the front end of the expansion sleeve is used to tighten the workpiece, and the rear end of the expansion sleeve is provided with a first connecting portion in the circumferential direction.

[0015] The rear end of the mandrel is positioned and connected with the clamp body in the rearward direction of the axis, and the cone at the front end of the mandrel is sleeve-fitted with the tapered inner hole of the expansion sleeve;

[0016] The push-pull sleeve is installed in the accommodating cavity of the clamp body, and its outer circle is slidably matched with the inner hole corresponding to the clamp body in the axial direction of the clamp body, and a rear push end face for abutting against the elastic member is provided on the push-pull sleeve, and the rear push end face is arranged toward the front of the clamp body; a front fixed end face for abutting against the elastic member is provided inside the cylindrical structure of the clamp body corresponding to the rear push end face, and the front fixed end face is arranged toward the rear of the clamp body; the push-pull sleeve is provided with a second connecting portion on the circumference of its front end portion;

[0017] The push-pull ring can be a symmetrically arranged split structure, and the push-pull ring has a third connection part fixedly connected to the first connection part and the second connection part, and the third connection part in the push-pull ring is buckled with the first connection part in the circumferential direction of the expansion sleeve and the second connection part in the circumferential direction of the push-pull sleeve, so that the push-pull sleeve, the push-pull ring and the expansion sleeve are connected and fixed in the axial direction of the clamp body;

[0018] An axial limiting portion is provided on at least one of the expansion sleeve, the push-pull ring and the push-pull sleeve; an axial limiting surface is provided on at least one of the clamp body and the end face positioning flange; the axial limiting portion contacts and cooperates with the axial limiting surface to limit the position of the expansion sleeve relative to the end face positioning flange in the axial direction in terms of forward displacement and backward displacement;

[0019] One end of the elastic member abuts against the front fixed end face of the clamp body, and the other end abuts against the rear push end face of the push-pull sleeve. Under the elastic force of the elastic member and the limiting action of the front fixed end face, the push-pull sleeve forms a thrust for the push-pull sleeve, the push-pull ring and the expansion sleeve to move backward along the axis of the clamp body; under normal conditions, the elastic member drives the push-pull sleeve, the push-pull ring and the expansion sleeve fixed with the push-pull sleeve to slide backward, and the expansion sleeve expands radially after sliding backward for a distance through the interaction between the cone of the core shaft and the tapered inner hole of the expansion sleeve, thereby realizing the positioning and clamping of the inner hole of the workpiece;

[0020] The linear drive mechanism is fixedly connected to the clamp body, and the driving end of the linear drive mechanism extends forward to the accommodating cavity of the clamp body and is fixedly connected to the push-pull sleeve; when the expansion sleeve needs to be loosened, the linear drive mechanism is controlled to drive the push-pull sleeve and the push-pull ring and the expansion sleeve connected to the push-pull sleeve to slide forward, compressing the elastic part, and the expansion sleeve is loosened from the core shaft after moving forward a certain distance, and the expansion sleeve radially contracts to relax the inner hole of the workpiece.

[0021] Furthermore, two groups of adjustment holes at 90° to each other are opened on the circumference of the base, and self-aligning screws are screwed into the adjustment holes. The self-aligning screws can push the circumferential surface of the clamp body, and can adjust the concentricity of the axis of the workpiece positioning clamping mechanism at the front end of the accompanying clamp and the axis of the zero-point positioning interface at the rear end in two directions at 90° to each other, which is used to adjust the coaxiality of the axis of the clamp body and the zero-point positioning center axis of the base.

[0022] The zero-point positioning interface adopted at the rear end of the accompanying fixture is the same as the zero-point positioning interface used for the transmission of electrodes and other related tools transmitted online, so as to realize the standardization of the transmission of related materials online, and the transmission is convenient and reliable. A fixing hole is opened on the base, and the axis center of the fixing hole coincides with the axis center of the clamp body. The pull pin is fixed in the fixing hole. A zero-point positioning piece and a supporting foot are arranged on the rear end surface of the base. The pull pin, zero-point positioning piece and supporting foot arranged at the rear end of the base form the zero-point positioning mechanical interface of the accompanying fixture, so that the online robot gripper can grasp the pull pin, transmit it online, and automatically clamp, position or remove it with the automatic chuck on the production line.

[0023] In the portable clamp of the present invention, all parts that come into contact with the aqueous working fluid when in use are made of corrosion-resistant materials, meeting the requirements of corrosion resistance and rust prevention.

[0024] The present invention arranges an elastic expansion sleeve in the front end cavity of the portable clamp, and the elastic body pulls the push-pull sleeve and the push-pull ring backward, so that the precise conical inner hole of the elastic expansion sleeve is pulled backward along the axial direction of the precision cone of the mandrel, the elastic expansion sleeve expands, and tightens the inner hole of the sleeve-like workpiece to achieve precise positioning of the workpiece; the linear drive mechanism is controlled to push the push-pull sleeve and the push-pull ring forward along the axis of the clamp body, so that the elastic expansion sleeve moves forward, and the elastic expansion sleeve contracts to automatically release the workpiece. The portable clamp is provided with a center adjustment mechanism between the clamp body and the base to achieve coaxial adjustment of the central axis between the two.

[0025] The relevant contents in the above technical solution are explained as follows:

[0026] 1. In the above scheme, the term "forward", "front end", "front part" and "front" means the direction in which the expansion sleeve protrudes from the end surface positioning flange to the axis direction of the clamp body, which is used for clamping the workpiece; the term "rear" means the direction opposite to the direction in which the expansion sleeve protrudes from the end surface positioning flange to the axis direction of the clamp body;

[0027] 2. In the above scheme, the terms "install", "connect", "connect", "fix" and the like 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; it can be a direct connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] 3. In the above schemes, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] 4. In the above scheme, in order to allow the push-pull ring to better connect and fix the expansion sleeve and the push-pull sleeve together, and to make the three as a whole slide more smoothly and orderly, and to have a sliding limit, so that the workpiece is displaced by an appropriate distance after being tightened, and to avoid damage to the workpiece, the push-pull ring is located inside the end face positioning flange, the outer circumferential surface of the push-pull ring slides along the inner hole of the end face positioning flange, the axial limiting surface includes an axial front limiting surface and an axial rear limiting surface, the axial front limiting surface is located on the rearward surface of the end face positioning flange, the axial rear limiting surface is located on the forward surface of the clamping body, and the axial limiting portion is located on the push-pull ring; the axial limiting portion is contacted and matched with the axial front limiting surface to limit the axial forward sliding position of the expansion sleeve relative to the end face positioning flange; the axial limiting portion is contacted and matched with the axial rear limiting surface to limit the axial backward sliding position of the expansion sleeve relative to the end face positioning flange.

[0030] 5. In the above scheme, a columnar fixing part is provided at the center of the front end of the clamp body, the fixing part is columnar and extends in the axial direction, and is used to be fixedly connected with the rear end column of the mandrel, so that the mandrel column is located at the fixing part at the center of the clamp body, ensuring that the expansion sleeve and the conical surface of the mandrel are evenly stressed when they are tightened, so that the radial force on the workpiece is more even when it is tightened, and when the workpiece approaches the positioning end face, the force acting on the workpiece end face and the positioning end face can also be more even, thereby improving the positioning accuracy and avoiding damage to the workpiece due to uneven force or positioning deviation.

[0031] 6. In the above scheme, in order to facilitate the overall assembly of the portable clamp and enable the push-pull sleeve to better slide with guidance on the clamp body, the clamp body is provided with a plurality of symmetrical guide holes around the fixed part, and the push-pull sleeve is provided with a plurality of push-pull claws corresponding to the guide holes at the front end, and the push-pull claws are assembled into the guide holes to achieve the sliding cooperation between the push-pull sleeve and the clamp body, and the push-pull claws are provided with a second connecting portion on the circumferential surface thereof, and the second connecting portion is a downwardly concave groove.

[0032] 7. In the above scheme, in order to make the push-pull ring better connect and fix the expansion sleeve and the push-pull sleeve together, so that the three are kept coaxially connected, the first connection part provided on the circumference of the rearward part of the expansion sleeve is a downwardly concave groove, and the third connection part on the push-pull ring is a protruding block provided at both ends of the inner edge of the push-pull ring, and the third connection part is inserted into the first connection part and the second connection part, so that the push-pull sleeve, the push-pull ring and the expansion sleeve are kept connected in the axial direction of the clamp body.

[0033] 8. In the above scheme, in order to make the elastic member cooperate with the push-pull sleeve better, so that the deformation force of the elastic member acts on the push-pull sleeve more evenly and smoothly, so that the expansion sleeve can slide backwards better to be tightened, the elastic member is a spring, a spring cavity is opened inside the push-pull sleeve, the rearward push end face is arranged at the rear end of the spring cavity, the front fixed end face is located on the rear end face of the clamp body and the core shaft, the elastic member is located in the spring cavity and is guided by the spring cavity along the axial direction of the clamp body, and the elastic member forms a backward push force on the push-pull sleeve.

[0034] 9. In the above scheme, a push-pull limit block protruding outward in the circumferential direction is arranged on the rearward side of the push-pull sleeve, and the rearward push end surface is arranged on the side of the push-pull limit block facing the front of the clamp body. The elastic member is sleeved on the outer side of the push-pull sleeve and contacts the rearward end surface of the outer edge of the push-pull sleeve, so that the push-pull sleeve has a thrust to move backward along the axis of the clamp body. Such a structure can also make the elastic member cooperate well with the push-pull sleeve.

[0035] 10. In the above scheme, the rear end of the portable fixture is provided with a rivet, a zero-point positioning sheet and a supporting foot. The robot's gripper can grab the rivet, realize the automatic in-line transmission of the portable fixture, and realize the precise zero-point positioning and automatic clamping or disengagement on the automatic chuck of the equipment.

[0036] The design principle and technical conception of the present invention are: in order to meet the needs of high-precision positioning and automatic transmission of sleeve-type workpieces in a flexible automatic production line with an electrical machining machine as the main body, according to the characteristic that parts have basically no cutting force in electrical machining, when using an elastic expansion sleeve for sleeve-type positioning fixtures, the traditional metal cutting workpieces such as turning, milling, and grinding must be subjected to a large cutting force, and the method of using a large-specification oil cylinder or air cylinder with a large driving force to pull the expansion sleeve is abandoned. Instead, a spring with a certain pulling force is used to pull the expansion sleeve and a small linear drive mechanism is used to loosen the expansion sleeve, so that the accompanying fixture can not only achieve high-precision positioning of the sleeve workpiece using the expansion sleeve, reliable automatic clamping and loosening, but also the structure of the fixture is obviously simple, which greatly reduces the volume and weight, and also greatly reduces the manufacturing cost; at the same time, a standard high-precision zero-point positioning mechanical interface with automatic positioning and clamping that is the same as the transmission of other related tools such as electrodes on the automatic line is configured to achieve reliable, accurate and convenient transmission of the accompanying fixture within the line, which well meets the requirements of material transmission of flexible automatic lines with electrical machining machine tools as the main body.

[0037] Due to the application of the above scheme, the present invention has the following advantages and effects compared with the prior art:

[0038] 1. In the above scheme of the present invention, considering that the portable fixture is used on an electric machining center, has no cutting force and requires little clamping force for the workpiece, a customized fixture is specially designed for sleeve workpieces using expansion sleeve positioning and clamping. The customized fixture is small in size and light in weight. The customized fixture is made of stainless steel material and is rust-proof, meeting the requirements for use on electric machining centers using water-based working fluids.

[0039] 2. In the above scheme of the present invention, an elastic member is used instead of other complicated cylinders or electric push mechanisms to drive the expansion sleeve to slide backward. When driving the expansion sleeve to slide backward, its tapered inner hole interacts with the outer cone of the core shaft, so that the expansion sleeve expands radially and evenly. While tightening the inner hole of the workpiece, the workpiece is moved toward the positioning end face of the end face positioning flange along with the expansion sleeve, and fits tightly and adaptively with the positioning end face. In this process, the expansion sleeve can accurately position and clamp the inner hole of the workpiece, and can also make the rearward end face of the workpiece fit perfectly with the forward flange positioning end face, so that the workpiece can be positioned with high precision and protected from damage.

[0040] 3. In the above scheme of the present invention, since the workpiece is clamped and tightened by using an elastic member to drive the expansion sleeve, its structure is ingenious and simple, small in size and light in weight, which can significantly reduce the cost of the accompanying fixture. For flexible automatic lines that require a large number of accompanying fixtures, it can greatly reduce the cost of line construction.

[0041] 4. Through the application of the above-mentioned scheme of the present invention, since the portable fixture of the present invention can have a smaller volume and lighter weight, some components in the portable fixture can be made of corrosion-resistant materials to meet the use requirements on electric machining centers using water-based working fluids.

[0042] 5. Since the portable clamp of the present invention is small in size and light in weight, its automatic transmission within the line is more convenient and requires less working space for the equipment.

[0043] 6. In the above scheme of the present invention, the positioning of the sleeve-type workpiece is set on the positioning end face of the end face positioning flange. At the same time, a zero-point positioning plate is set on the base fixed to the clamp body and the end face positioning flange as the positioning reference of the zero-point positioning system of the accompanying fixture, so that the accompanying fixture can be consistent with the zero-point positioning system adopted by the electrode and other tools in the production line. The transmission on the automatic line is not only high-precision, but also more convenient and reliable.

[0044] 7. The present invention can realize automatic positioning, clamping and disengagement of the workpiece, and can more flexibly meet the requirements of automated loading and unloading of the workpiece.

[0045] 8. In summary, the present invention is designed based on the characteristics of no cutting force and small clamping force requirements for workpieces in EDM machining. The sleeve-type workpiece accompanying fixture for the flexible automated EDM production line of the present invention has the advantages of small size and light weight, can be made of stainless steel materials, rust-proof, and meet the use requirements of EDM machines using water-based working fluids. Moreover, the zero-point positioning system used by the accompanying fixture is consistent with the zero-point positioning system used for tool exchange such as in-line electrodes. The transmission on the automatic line is not only high-precision, more convenient and reliable, but also can realize automatic positioning and loading and unloading of workpieces, and the use on the automatic line is more flexible and convenient; the accompanying fixture also has the advantage of being cheaper, and the cost of mass adoption is lower. Therefore, the customized fixture is particularly suitable for use as a high-precision accompanying fixture in a flexible automatic production line with EDM as the main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Attached Figure 1 It is a three-dimensional schematic diagram of a portable clamp according to an embodiment of the present invention;

[0047] Attached Figure 2 It is a front view of an embodiment of the present invention;

[0048] Attached Figure 3 for Figure 2 Schematic diagram of the AA section;

[0049] Attached Figure 4 for Figure 3 The enlarged schematic diagram of Part I in FIG.

[0050] Attached Figure 5 It is a left side view of an embodiment of the present invention;

[0051] Attached Figure 6 for Figure 5 Schematic diagram of the cross section along the BB direction;

[0052] Attached Figure 7 It is a three-dimensional schematic diagram of an embodiment of the present invention when it is installed on an automatic chuck and clamping a sleeve-type workpiece;

[0053] Attached Figure 8 This is a front view of the embodiment of the present invention when it is installed on an automatic chuck and clamping a sleeve-type workpiece;

[0054] Attached Fig. 9 for Figure 8 Schematic diagram of the CC section;

[0055] Attached Fig.10 It is a schematic three-dimensional diagram of the assembly of the expansion sleeve, the core shaft, the push-pull sleeve, the push-pull ring and the linear drive mechanism in the embodiment of the present invention;

[0056] Attached Fig.11 It is a schematic front view of the assembly of the expansion sleeve, the core shaft, the push-pull sleeve, the push-pull ring and the linear drive mechanism in the embodiment of the present invention;

[0057] Attached Fig.12 for Fig.11 The middle DD section is shown;

[0058] Attached Fig.13 It is a schematic three-dimensional diagram of the assembly of the clamp body and the end surface positioning flange in the embodiment of the present invention;

[0059] Attached Fig.14 It is a schematic front view of the assembly of the clamp body and the end face positioning flange in the embodiment of the present invention;

[0060] Attached Fig.15 for Fig.14 The cross section in the middle EE direction is shown;

[0061] Attached Fig.16 It is a three-dimensional schematic diagram of a clamping body in an embodiment of the present invention;

[0062] Attached Fig.17 This is a front view of a clamping structure in an embodiment of the present invention;

[0063] Attached Fig.18 for Fig.17 The cross section in the middle FF direction is shown;

[0064] Attached Fig.19 for Fig.17 The cross section in the middle GG direction is shown;

[0065] Attached Fig. 20It is a three-dimensional schematic diagram of the expansion sleeve in the embodiment of the present invention;

[0066] Attached Fig.21 This is a front view of the expansion sleeve in the embodiment of the present invention;

[0067] Attached Fig. 22 for Fig.21 The middle HH section is shown;

[0068] Attached Fig.23 It is a three-dimensional schematic diagram of a push-pull sleeve in an embodiment of the present invention;

[0069] Attached Fig.24 This is a front view of the push-pull sleeve in the embodiment of the present invention;

[0070] Attached Fig.25 for Fig.24 The section along the middle II is shown;

[0071] Attached Fig.26 It is a three-dimensional schematic diagram of a push-pull ring in an embodiment of the present invention;

[0072] Attached Fig. 27 This is a front view of the push-pull ring in the embodiment of the present invention;

[0073] Attached Fig.28 for Fig. 27 The JJ section is shown in the middle;

[0074] Attached Fig.29 It is a schematic diagram of the structure in which the elastic member is sleeved on the outside of the push-pull sleeve in an embodiment of the present invention;

[0075] Attached Fig.30 for Fig.29 Assembly diagram of the middle clamp body, push-pull sleeve and elastic member.

[0076] In the above attached figure:

[0077] 1. Clamp body; 11. Accommodating cavity; 12. Front fixed end surface; 131. Axial rear limiting surface; 14. Fixing part; 15. Guide hole;

[0078] 2. Base; 21. Adjustment hole; 22. Aligning screw; 23. Fixing hole; 24. Pull rivet; 25. Zero point positioning piece; 26. Support foot;

[0079] 3. End face positioning flange; 31. Opening; 32. Positioning end face; 33. Axial limiting surface; 331. Axial front limiting surface;

[0080] 4. expansion sleeve; 41. tapered inner hole; 42. first connecting portion;

[0081] 5. Mandrel; 51. Cone;

[0082] 6. Push-pull sleeve; 61. rear push end face; 62. push-pull claw; 63. second connecting part; 64. spring cavity; 65. push-pull limit block;

[0083] 7. Push-pull ring; 71. third connecting portion; 72. axial limiting portion;

[0084] 8. Elastic parts;

[0085] 9. Linear drive mechanism;

[0086] 101. Automatic chuck;

[0087] 102. Turntable;

[0088] A. Workpiece. DETAILED DESCRIPTION

[0089] The present invention is further described below in conjunction with the accompanying drawings and embodiments, wherein for the convenience of explanation, Figure 7 The workpiece A, the turntable 102 and the automatic chuck 101 are drawn in the figure, but it should be known that the workpiece A, the turntable 102 and the automatic chuck 101 are not components of the portable fixture of the embodiment of the present invention.

[0090] Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0091] See attached Figure 1 To Attachment Figure 3 As shown, an embodiment of the present invention provides a sleeve-type workpiece accompanying fixture for a flexible automated electrical machining production line, the accompanying fixture comprising a clamp body 1, a base 2, an end face positioning flange 3, an expansion sleeve 4, a core shaft 5, and a linear drive mechanism 9; the clamp body 1 is a cylindrical structure, and the clamp body 1 has a accommodating cavity 11 arranged front and back along the axial direction of the clamp body 1; the base 2 is fixed at the rear end of the clamp body 1, and the base 2 is used for zero-point positioning of the mechanical interface; the end face positioning flange 3 is fixed at the front end of the clamp body 1, and the end face positioning flange 3 has an opening 31; the expansion sleeve 4 is inserted into the opening 31 of the end face positioning flange 3, and the expansion sleeve 4 has a tapered inner hole 41, the axis of the tapered inner hole 41 is consistent with the axis direction of the clamp body 1, and the aperture of the tapered inner hole 41 gradually expands from the front end to the rear end; the front end of the core shaft 5 has a cone 51, and the diameter of the cone 51 gradually expands from the front end to the rear end.

[0092] The innovative description of the embodiments of the present invention is as follows:

[0093] See attached Figure 1 To Attachment Fig.15As shown, in the embodiment of the present invention, the front end surface of the end face positioning flange 3 is a positioning end face 32, and the positioning end face 32 is perpendicular to the axial direction of the clamp body 1. A push-pull ring 7, a push-pull sleeve 6, an elastic member 8 and a linear drive mechanism 9 are provided in the clamp body 1 and the end face positioning flange 3 to drive the expansion sleeve 4 to slide along the axial direction of the clamp body 1;

[0094] The front end of the expansion sleeve 4 is located at the front side of the opening 31 of the end surface positioning flange 3, and the rear end of the expansion sleeve 4 is located at the rear side of the opening 31 of the end surface positioning flange 3. The outer circumferential surface of the front end of the expansion sleeve 4 is used to tighten the workpiece A. The rear end of the expansion sleeve 4 is provided with a first connecting portion 42 in the circumferential direction.

[0095] The rear end of the mandrel 5 is positioned and connected with the clamp body 1 in the rearward direction of the axis, and the cone 51 at the front end of the mandrel 5 is sleeve-fitted with the tapered inner hole 41 of the expansion sleeve 4;

[0096] The push-pull sleeve 6 is installed in the accommodating cavity 11 of the clamp body 1, and its outer circle is slidably matched with the corresponding inner hole of the clamp body 1 in the axial direction of the clamp body 1. The push-pull sleeve 6 is provided with a rear push end face 61 for abutting against the elastic member 8, and the rear push end face 61 is arranged toward the front of the clamp body 1; corresponding to the rear push end face 61, a front fixed end face 12 for abutting against the elastic member 8 is arranged inside the cylindrical structure of the clamp body 1, and the front fixed end face 12 is arranged toward the rear of the clamp body 1; the push-pull sleeve 6 is provided with a second connecting portion 63 on the circumference of its front end portion;

[0097] The push-pull ring 7 can be a symmetrically arranged split structure, and the push-pull ring 7 has a third connection part 71 fixedly connected to the first connection part 42 and the second connection part 63. The third connection part 71 in the push-pull ring 7 is buckled with the first connection part in the circumferential direction of the expansion sleeve 4 and the second connection part 63 in the circumferential direction of the push-pull sleeve 6, so that the push-pull sleeve 6, the push-pull ring 7 and the expansion sleeve 4 are connected and fixed in the axial direction of the clamp body 1;

[0098] An axial limiting portion 72 is provided on at least one of the expansion sleeve 4, the push-pull ring 7 and the push-pull sleeve 6; an axial limiting surface 33 is provided on at least one of the clamp body 1 and the end face positioning flange 3; the axial limiting portion 72 contacts and cooperates with the axial limiting surface 33 to limit the position of the expansion sleeve 4 relative to the end face positioning flange 3 in the axial direction.

[0099] One end of the elastic member 8 abuts against the front fixed end face 12 of the clamp body 1, and the other end abuts against the rear push end face 61 of the push-pull sleeve 6. Under the elastic force of the elastic member 8 and the limiting action of the front fixed end face 12, the push-pull sleeve 6 forms a thrust to pull the push-pull sleeve 6 axially backward; under normal conditions, the elastic member 8 drives the push-pull sleeve 6 and the push-pull ring 7 and the expansion sleeve 4 fixed to the push-pull sleeve 6 to slide backward. After sliding backward for a distance, the expansion sleeve 4 expands through the radial action of the cone 51 of the core shaft 5 and the tapered inner hole 41 of the expansion sleeve 4, thereby realizing the positioning and clamping of the inner hole of the workpiece;

[0100] The linear drive mechanism 9 is fixedly connected to the clamp body 1, and the driving end of the linear drive mechanism 9 extends forward to the accommodating cavity 11 of the clamp body 1 and is fixedly connected to the push-pull sleeve 6; when the expansion sleeve needs to be loosened, the linear drive mechanism 9 drives the push-pull sleeve 6 and the push-pull ring 7 and the expansion sleeve 4 fixed to the push-pull sleeve 6 to slide forward, and the expansion sleeve 4 is loosened from the core shaft 5 after moving forward for a distance, and the expansion sleeve radially contracts to relax the inner hole of the workpiece.

[0101] The present invention sets an elastic expansion sleeve 4 in the front end cavity of the portable clamp, and pulls the push-pull sleeve 6 and the push-pull ring 7 from behind by the elastic body 8, so that the precise conical inner hole 41 of the elastic expansion sleeve 4 is pulled backward along the axial direction of the precise cone 51 of the mandrel 5, and the elastic expansion sleeve 4 expands and tightens the inner hole of the sleeve-like workpiece A, thereby realizing the precise positioning of the workpiece A; the linear drive mechanism 9 is controlled to push the push-pull sleeve 6 and the push-pull ring 7 forward along the axis of the clamp body 1, so that the elastic expansion sleeve 4 moves forward, and the elastic expansion sleeve 4 contracts and automatically releases the workpiece A. The portable clamp sets a center adjustment mechanism between the clamp body 1 and the base 2 to realize the coaxial adjustment of the central axis between the two.

[0102] More specifically, through the implementation of the above embodiments, the present invention positions and installs the core shaft 5 on the clamp body 1, so that the core shaft 5 remains stationary relative to the clamp body 1 in the axial direction of the clamp body 1, and the expansion sleeve 4, push-pull ring 7 and push-pull sleeve 6 are arranged to slide as a whole in the axial direction of the clamp body 1. This whole is driven by the elastic member 8 and the linear drive mechanism 9, and the workpiece A is clamped by the front end of the expansion sleeve 4 located on the front side of the end face positioning flange 3. When the workpiece A clamped in the expansion sleeve 4 needs to be tightened and positioned, the linear drive mechanism 9 does not work. Under the elastic action of the elastic member 8, the push-pull sleeve 6, the push-pull ring 7 and the expansion sleeve 4 are driven to slide toward the rear direction of the axis of the clamp body 1. At this time, the expansion sleeve 4 drives the workpiece A thereon to slide a certain distance toward the rear direction of the axis of the clamp body 1. The surface of the workpiece A adapts itself to fit closely with the positioning end face 32 of the end face positioning flange 3, so that the workpiece A is precisely positioned. At the same time, the expansion sleeve 4 radially tightens the workpiece A under the tightening action of the core shaft 5, so that the workpiece A is firmly clamped on the expansion sleeve 4. This simple and ingenious tightening structure is adopted because the clamping of the workpiece A does not need to consider its chip force during the electromachining process, and the tightening force requirement is small. According to the structural characteristics of sleeve-type parts, the accompanying The clamp adopts the elastic expansion sleeve 4, and takes the precise inner hole of the sleeve parts as the positioning reference, so as to firmly, reliably and conveniently position and clamp the sleeve parts on the accompanying clamp; when the workpiece A needs to be loosened, the linear drive mechanism 9 works, and the linear drive mechanism 9 drives the push-pull sleeve 6, the push-pull ring 7 and the expansion sleeve 4 to slide forward in the axis direction of the clamp body 1, so that the expansion sleeve 4 moves forward a certain distance to disengage from the tensioning fit with the core shaft 5. At this time, the workpiece A can be easily removed from the expansion sleeve 4. It can be seen that the driving accuracy requirements and driving force requirements of the linear drive mechanism 9 in the present invention are very low, and its structure does not need to be too complicated, so that the overall accompanying clamp can be designed to be smaller in size and lighter in weight, and can also be better rust-proof. The components that will come into contact with the aqueous working fluid can be made of stainless steel. Therefore, the technical solution of the present invention not only overcomes the problem of insufficient positioning accuracy of commonly used sleeve-type clamps, but also overcomes the problems of large size, heavy weight, no rust prevention, and inconsistency between the zero point positioning system and the zero point positioning system of other tools such as electrodes exchanged in the line using the standard precision expansion sleeve workpiece A automatic positioning clamping and replacement clamp.

[0103] A sleeve-type workpiece traveling fixture for a flexible automated electrical machining production line according to an embodiment of the present invention is compared with an existing standard precision expansion sleeve workpiece automatic positioning, clamping and replacement fixture. A comparison between the two can be referred to Table 1, wherein the sleeve-type workpiece traveling fixture for a flexible automated electrical machining production line according to an embodiment of the present invention is referred to as a "customized fixture", and the existing standard precision expansion sleeve workpiece automatic positioning, clamping and replacement fixture is referred to as a "standard fixture".

[0104]

[0105] Table 1

[0106] As can be seen from Table 1, the sleeve-type workpiece traveling fixture for the flexible automated electro-machining production line using the embodiment of the present invention is lighter and smaller in size than the existing standard fixture while ensuring that the automatic tightening positioning accuracy of the parts and the zero-point positioning accuracy of the fixture are equivalent. The automatic clamping adopted by the replacement is completed by a rivet 24 and an automatic chuck 101. The structure of this part can also be simpler and can be made of stainless steel, which is suitable for working environments with aqueous working fluids. The degree of integration between the zero-point positioning system of the fixture and the zero-point positioning system of the in-line electrode is the same as the zero-point positioning system of the electrode on the electro-machining machine, realizing the integration of the zero-point positioning system and the online transmission. Therefore, it is more suitable for use as a high-precision traveling fixture in a flexible automatic production line with an electro-machining machine as the main body. At the same time, the price of the traveling fixture using the embodiment of the present invention is also cheaper, and the cost of mass adoption is lower.

[0107] In the embodiment of the present invention, in order to ensure that the center line of the clamp body 1 can be aligned with the base 2 and the automatic chuck 101, a plurality of penetrating adjustment holes 21 are opened on the circumference of the base 2, and the adjustment holes 21 are screwed with centering screws 22, and the centering screws 22 are tightly fitted with the circumferential surface of the clamp body 1. The center line of the clamp body 1 is adjusted by adjusting the distance of the centering screws 22 in the adjustment holes 21. The number of the adjustment holes 21 can be four, and two groups of adjustment holes 21 at 90 degrees to each other are symmetrically arranged on the circumference of the base 2.

[0108] In the embodiment of the present invention, in order to allow the push-pull ring 7 to better connect the expansion sleeve 4 and the push-pull sleeve 6 together, and to make the three as a whole slide more smoothly and orderly, and to have a sliding limit, so that the displacement distance of the workpiece A after being tightened is appropriate and suitable, and to avoid damage to the workpiece A, the push-pull ring 7 is located inside the end face positioning flange 3, and the circumferential surface of the push-pull ring 7 slides along the inner edge of the end face positioning flange 3. The axial limiting surface 33 includes an axial front limiting surface 331 and an axial rear limiting surface 131. The axial front limit surface 331 is located on the rear surface of the end face positioning flange 3, the axial rear limit surface 131 is located on the front surface of the clamp body 1, and the axial limit portion 72 is located on the push-pull ring 7; the axial limit portion 72 is contacted and matched with the axial front limit surface 331 to limit the axial forward sliding position of the expansion sleeve 4 relative to the end face positioning flange 3; the axial limit portion 72 is contacted and matched with the axial rear limit surface 131 to limit the axial backward sliding position of the expansion sleeve 4 relative to the end face positioning flange 3.

[0109] In the embodiment of the present invention, a columnar fixing portion 14 is provided at the center of the front end of the clamp body 1. The fixing portion 14 is columnar and extends axially. The fixing portion 14 is used to be fixedly connected to the rear end column of the core shaft 5. The front end of the core shaft 5 is a cone and the rear end is a column. In order to facilitate the overall assembly of the accompanying clamp and enable the push-pull sleeve 6 to better perform a guided sliding fit on the clamp body 1, the clamp body 1 is provided with a plurality of symmetrical guide holes 15 around the fixing portion 14. The push-pull sleeve 6 is provided with a plurality of push-pull claws 62 corresponding to the guide holes 15 toward the front end. The push-pull claws 62 are assembled into the guide holes 15 to achieve a sliding fit between the push-pull sleeve 6 and the clamp body 1. The push-pull claws 62 are provided with a second connecting portion 63 on their circumferential surface. The second connecting portion 63 is a downwardly recessed groove. The core shaft 5 is located at the fixing portion 14 at the center of the clamp body 1, ensuring that the expansion sleeve 4 and the conical surface of the core shaft 5 are evenly stressed when they are tightened. Therefore, the radial force on the workpiece A is more even when it is tightened. When the workpiece A approaches the positioning end face 32, the force between the end face of the workpiece A and the positioning end face 32 can also be more even, thereby improving the positioning accuracy and avoiding damage to the workpiece A due to uneven force or positioning deviation.

[0110] In the embodiment of the present invention, in order to enable the push-pull ring 7 to better connect and fix the expansion sleeve 4 and the push-pull sleeve 6 together so that they are tightly fixed without deviation in the axial direction of the clamp body 1, the first connecting portion 42 provided on the circumferential direction of the rear portion of the expansion sleeve 4 is a downwardly recessed groove, and the third connecting portion 71 on the push-pull ring 7 is a raised block provided at both ends of the inner edge of the push-pull ring 7. The third connecting portion 71 is inserted into the first connecting portion 42 and the second connecting portion 63, so that the push-pull sleeve 6, the push-pull ring 7 and the expansion sleeve 4 remain relatively fixed in the axial direction of the clamp body 1.

[0111] In order to make the elastic member 8 better cooperate with the push-pull sleeve 6, so that the deformation effect of the elastic member 8 can act on the push-pull sleeve 6 more evenly and smoothly, so that the expansion sleeve 4 can slide backward better for tightening, the elastic member 8 is a spring, and a spring cavity 64 is opened inside the push-pull sleeve 6. The rear push end face 61 is arranged at the rear end of the spring cavity 64, and the front fixed end face 12 is located on the rear end face of the fixing part 14. The elastic member 8 is located in the spring cavity 64 and is guided by the spring cavity 64 along the axial direction of the clamp body 1.

[0112] In the embodiment of the present invention, a push-pull limit block 65 protruding outward in the circumferential direction is provided on the rearward side of the push-pull sleeve 6, the rear push end face 61 is provided on the side of the push-pull limit block 65 facing the front of the clamp body 1, the front fixed end face 12 is provided on the clamp body 1 located in front of the push-pull limit block 65, the elastic member 8 is sleeved on the outside of the push-pull sleeve 6 and guided by the outer edge of the push-pull sleeve 6, one end of the elastic member 8 abuts against the clamp body 1 and the other end abuts against the push-pull limit block 65, so that the push-pull sleeve 6 has a tendency to move backward along the axis of the clamp body 1. The use of such a structure can also allow the elastic member 8 to better cooperate with the push-pull sleeve 6.

[0113] In an embodiment of the present invention, in order to ensure the uniformity of the positioning coordinate system when the accompanying clamp is moved and transferred between various workstations, a zero-point positioning piece 25 and a supporting foot 26 are provided on the rear end surface of the base 2, and a fixing hole 23 is opened on the base 2. The axis center of the fixing hole 23 coincides with the axis center of the clamp body 1, and a rivet 24 is fixed in the fixing hole 23. The rivet 24, the zero-point positioning piece 25 and the supporting foot 26 provided at the rear end of the base 2 form a zero-point positioning mechanical interface of the accompanying clamp, so that the online robot gripper can grasp the rivet 24, transfer it online, and automatically clamp, position or detach it with the automatic chuck on the production line, and the base 2 and the automatic chuck 101 can be quickly disassembled and assembled.

[0114] When the accompanying clamp in the present invention is in use, all the parts that come into contact with the aqueous working fluid are made of corrosion-resistant materials to meet the requirements of corrosion resistance and rust prevention. The corrosion-resistant material can be stainless steel, or it can be a corrosion-resistant material in which a chromium, nickel, aluminum, titanium or other alloy plating is added to steel to form a protective film. Specifically, the clamp body 1, the end face positioning flange 3, the base 2 and other parts can be made of surface anti-rust coating, and the core shaft 5, the push-pull sleeve 6, the push-pull ring 7 and the expansion sleeve 5 can be made of stainless steel. Because the core shaft 5, the push-pull sleeve 6, the push-pull ring 7 and the expansion sleeve 5 are small in size, the cost of making them with stainless steel is not high, which reduces the cost of mass adoption of the accompanying clamp. However, the present invention is not limited to this. Since the accompanying clamp of the present invention is cleverly designed, small in size, and the parts are not large, they can be selected according to actual conditions during manufacturing.

[0115] Taking the setting of the spring chamber 64 in the push-pull sleeve 6 as an example, when assembling the portable clamp of the present invention, the core shaft 5 is fixedly installed in the fixing part 14 at the front end center of the clamp body 1, the push-pull sleeve 6 is assembled with the fixing parts for fixed connection with the linear drive mechanism 9, the elastic part 8 is assembled, and then the push-pull claws 62 of the push-pull sleeve 6 are aligned with the guide holes 15 in the clamp body 1, the push-pull sleeve 6 is pushed forward and the tightening sleeve and the push-pull ring 7 are assembled, and then the end face positioning flange 3 is installed, and it is best to install other components; after the base 2 is installed, the center line of the clamp body 1 needs to be adjusted, and the adjustment can be carried out by the self-aligning screws 22 on the base 2.

[0116] With respect to the above-mentioned embodiment, possible changes of the present invention are described as follows:

[0117] 1. In the above embodiments, the axial limiting surface 33 includes an axial front limiting surface 331 and an axial rear limiting surface 131. The axial front limiting surface 331 is located on the rearward surface of the end face positioning flange 3, and the axial rear limiting surface 131 is located on the forward surface of the clamp body 1. The axial limiting portion 72 is located on the push-pull ring 7. The present invention is not limited to this. The axial limiting surface 33 can also be entirely set on the inner edge of the clamp body 1, and the axial limiting portion 72 can be set on the push-pull sleeve 6. The sliding position of the push-pull sleeve 6 and the expansion sleeve 4 linked to the push-pull sleeve 6 can also be limited.

[0118] 2. In the above embodiments, through the inventor's testing and actual application, the expansion sleeve 4 can reach the clamping state by moving backward 2 to 3 mm under the action of the elastic member 8, and can also completely and precisely position the workpiece A. In order for the expansion sleeve 4 to have this effect, the elastic force of the elastic member 8 used can be 15 kg to 20 kg. Therefore, the elastic member 8 can adopt a compression spring that meets the requirements, but the present invention is not limited to this. The elastic member 8 can also adopt a butterfly spring or other elastic member 8 that can also provide elastic force for the push-pull sleeve 6.

[0119] 3. In the above embodiment, a spring cavity 64 is opened inside the push-pull sleeve 6, the rear push end face 61 is arranged at the rear end of the spring cavity 64, and the front fixed end face 12 is located on the rear end face of the fixed portion 14. A push-pull limit block 65 protruding circumferentially outward may also be provided on the rear side of the push-pull sleeve 6, the rear push end face 61 is arranged on the side of the push-pull limit block 65 facing the front of the clamp body 1, and the front fixed end face 12 is arranged on the clamp body 1 located in front of the push-pull limit block 65. The present invention is not limited to this, and the elastic member 8 may also be fixed at other positions of the clamp body 1, and the rear push end face 61 against which the elastic member 8 abuts against the push-pull sleeve 6 may also be realized by other components connected to the push-pull sleeve 6.

[0120] 4. In the above embodiments, the push-pull ring 7 is a symmetrically arranged split structure. Only such a structure can be assembled into the clamp body 1 and the end face positioning flange 3 together with the push-pull sleeve 6 and the expansion sleeve 4. In order to facilitate the structural design and assembly, Fig. 9 , Fig.10 As shown, the push-pull ring 7 is divided into two upper and lower symmetrical split structures, but the present invention is not limited thereto, and the push-pull ring 7 may also be divided into three or four parts.

[0121] 5. In the above embodiments, if Fig.15As shown, the clamp body 1 is provided with four symmetrical guide holes 15 around the fixing portion 14, and correspondingly, four symmetrical push-pull claws 62 are provided on the push-pull sleeve 6. The present invention is not limited to this, and the guide holes 15 can also be other numbers, so as to ensure that the push-pull sleeve 6, the push-pull ring 7 and the expansion sleeve 4 remain fixed in the axial direction of the clamp body 1.

[0122] 6. In the above embodiments, the linear drive mechanism 9 may adopt a cylinder, and the driving rod in front of the cylinder drives the push-pull sleeve 6 to push forward. The present invention is not limited to this. The linear drive mechanism 9 may also adopt other structures that can perform linear transmission, such as electric cylinders and hydraulic cylinders.

[0123] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A sleeve-type workpiece traveling fixture for a flexible automated electrical machining production line, comprising a fixture body (1), a base (2), an end face positioning flange (3), an expansion sleeve (4), a core shaft (5), and a linear drive mechanism (9); The clamp body (1) is a cylindrical structure, and has a receiving cavity (11) arranged in the clamp body (1) along the front-rear direction of the axis of the clamp body (1); The base (2) is fixed to the rear end of the clamp body (1), and the base (2) is used for zero-point positioning of the mechanical interface; The end surface positioning flange (3) is fixed to the front end of the clamp body (1), and an opening (31) is provided on the end surface positioning flange (3); The expansion sleeve (4) is inserted into the opening (31) of the end surface positioning flange (3), and the expansion sleeve (4) has a tapered inner hole (41). The axis of the tapered inner hole (41) is consistent with the axis direction of the clamp body (1), and the diameter of the tapered inner hole (41) gradually increases from the front end to the rear end; The front end of the mandrel (5) has a cone (51), and the diameter of the cone (51) gradually increases from the front end to the rear end; Features: The front end surface of the end surface positioning flange (3) is a positioning end surface (32), and the positioning end surface (32) is perpendicular to the axial direction of the clamp body (1). A push-pull ring (7), a push-pull sleeve (6), and an elastic member (8) are provided in the clamp body (1) and the end surface positioning flange (3) to drive the expansion sleeve (4) to slide along the axial direction of the clamp body (1); The front end of the expansion sleeve (4) is located on the front side of the opening (31) of the end surface positioning flange (3), and the rear end of the expansion sleeve (4) is located on the rear side of the opening (31) of the end surface positioning flange (3). The outer circumferential surface of the front end of the expansion sleeve (4) is used to tighten the workpiece, and a first connecting portion (42) is provided on the circumference of the rear end of the expansion sleeve (4); The rear end of the mandrel (5) is positioned and connected to the clamp body (1) in the rearward direction of the axis, and the cone (51) at the front end of the mandrel (5) is sleeve-fitted with the conical inner hole (41) of the expansion sleeve (4); The push-pull sleeve (6) is installed in the accommodating cavity (11) of the clamp body (1), and its outer circle is slidably matched with the corresponding inner hole of the clamp body (1) in the axial direction. The push-pull sleeve (6) is provided with a rearward push end face (61) for abutting against the elastic member (8), and the rearward push end face (61) is arranged toward the front of the clamp body (1); a front fixed end face (12) for abutting against the elastic member (8) is arranged inside the cylindrical structure of the clamp body (1) corresponding to the rearward push end face (61), and the front fixed end face (12) is arranged toward the rear of the clamp body (1); the push-pull sleeve (6) is provided with a second connecting portion (63) in the circumferential direction of its front end portion; The push-pull ring (7) has a third connection portion (71) fixedly connected to the first connection portion (42) and the second connection portion (63); the third connection portion (71) in the push-pull ring (7) is buckled onto the first connection portion in the circumferential direction of the expansion sleeve (4) and the second connection portion (63) in the circumferential direction of the push-pull sleeve (6), so that the push-pull sleeve (6), the push-pull ring (7) and the expansion sleeve (4) are connected and fixed in the axial direction; An axial limiting portion (72) is provided on at least one of the expansion sleeve (4), the push-pull ring (7) and the push-pull sleeve (6); an axial limiting surface (33) is provided on at least one of the clamp body (1) and the end face positioning flange (3); the axial limiting portion (72) is in contact with the axial limiting surface (33) to limit the axial forward and backward displacement of the expansion sleeve (4) relative to the end face positioning flange (3); One end of the elastic member (8) abuts against the front fixed end face (12) of the clamp body (1), and the other end abuts against the rear push end face (61) of the push-pull sleeve (6). Under the elastic force of the elastic member (8) and the limiting action of the front fixed end face (12), the push-pull sleeve (6) forms a thrust force that pulls the push-pull sleeve (6) axially backward; under normal conditions, the elastic member (8) drives the push-pull sleeve (6) and the push-pull ring (7) and the expansion sleeve (4) connected to the push-pull sleeve (6) to slide backward. After sliding backward for a certain distance, the expansion sleeve (4) expands through the radial action of the cone (51) of the core shaft (5) and the tapered inner hole (41) of the expansion sleeve (4), thereby achieving positioning and clamping of the inner hole of the workpiece; The linear drive mechanism (9) is positioned and connected to the clamp body (1), and the driving end of the linear drive mechanism (9) extends forward to the receiving cavity (11) of the clamp body (1) and is fixedly connected to the push-pull sleeve (6); when it is necessary to loosen the expansion sleeve (4), the linear drive mechanism (9) is controlled to drive the push-pull sleeve (6) and the push-pull ring (7) and the expansion sleeve (4) fixed to the push-pull sleeve (6) to slide forward, compressing the elastic member (8), and the expansion sleeve (4) is released from the core shaft (5) after moving forward for a certain distance, and the expansion sleeve (4) radially contracts to relax the inner hole of the workpiece.

2. The sleeve-type workpiece traveling fixture for the flexible automated electrical machining production line according to claim 1 is characterized in that: The push-pull ring (7) is located inside the end face positioning flange (3), and the outer circumferential surface of the push-pull ring (7) is slidably matched along the inner hole of the end face positioning flange (3); the axial limit surface (33) includes an axial front limit surface (331) and an axial rear limit surface (131), the axial front limit surface (331) is located on the rearward surface of the end face positioning flange (3), the axial rear limit surface (131) is located on the forward surface of the clamp body (1), and the axial limit portion (72) is located on the push-pull ring (7); the axial limit portion (72) is contacted and matched with the axial front limit surface (331) to limit the axial forward sliding position of the expansion sleeve (4) relative to the end face positioning flange (3); the axial limit portion (72) is contacted and matched with the axial rear limit surface (131) to limit the axial backward sliding position of the expansion sleeve (4) relative to the end face positioning flange (3).

3. The sleeve-type workpiece traveling fixture for the flexible automated electrical machining production line according to claim 1 is characterized in that: The clamp body (1) is provided with a fixing portion (14) at the center of the front end. The fixing portion (14) is columnar and extends in the axial direction. The fixing portion (14) is used to be fixedly connected to the rear end of the core shaft (5).

4. The sleeve-type workpiece traveling fixture for the flexible automated electrical machining production line according to claim 3 is characterized in that: The clamp body (1) is provided with a plurality of symmetrical guide holes (15) around the fixing part (14); the push-pull sleeve (6) is provided with a plurality of push-pull claws (62) corresponding to the guide holes (15) at the front end thereof; the push-pull claws (62) are assembled into the guide holes (15) to achieve sliding fit between the push-pull sleeve (6) and the clamp body (1); the push-pull claws (62) are provided with a second connecting part (63) on the circumferential surface thereof; the second connecting part (63) is a downwardly recessed groove.

5. The sleeve-type workpiece traveling fixture for the flexible automated electrical machining production line according to claim 4 is characterized in that: The first connection portion (42) provided on the circumferential direction of the rearward portion of the expansion sleeve (4) is a downwardly recessed groove, and the third connection portion (71) on the push-pull ring (7) is a protruding block provided at both ends of the inner edge of the push-pull ring (7). The third connection portion (71) is inserted into the first connection portion (42) and the second connection portion (63) so that the push-pull sleeve (6), the push-pull ring (7) and the expansion sleeve (4) are connected and fixed in the axial direction of the clamp body (1).

6. The sleeve-type workpiece traveling fixture for a flexible automated electrical machining production line according to claim 1 is characterized in that: The elastic member (8) is a spring, a spring cavity (64) is provided inside the push-pull sleeve (6), the rear push end face (61) is arranged at the rear end of the spring cavity (64), the front fixed end face (12) is located on the rear end face of the fixed portion (14), the elastic member (8) is located in the spring cavity (64) and is guided by the spring cavity (64) along the axial direction of the clamp body (1).

7. The sleeve-type workpiece traveling fixture for a flexible automated electrical machining production line according to claim 1 is characterized in that: A push-pull limit block (65) protruding outward in the circumferential direction is arranged on the rearward side of the push-pull sleeve (6); a rear push end face (61) is arranged on the side of the push-pull limit block (65) facing the front of the clamp body (1); a front fixed end face (12) is arranged on the clamp body (1) in front of the push-pull limit block (65); an elastic member (8) is sleeved on the outer side of the push-pull sleeve (6) and guided by the outer edge of the push-pull sleeve (6); one end of the elastic member (8) abuts against the clamp body (1) and the other end abuts against the push-pull limit block (65), thereby forming a thrust for the push-pull sleeve (6) to move backward along the axis of the clamp body (1).

8. The sleeve-type workpiece traveling fixture for a flexible automated electrical machining production line according to claim 1 is characterized in that: A zero point positioning sheet (25) and a supporting foot (26) are provided on the rear end surface of the base (2).

9. The sleeve-type workpiece traveling fixture for the flexible automated electrical machining production line according to claim 8 is characterized in that: The base (2) is provided with a fixing hole (23), the axis center of the fixing hole (23) coincides with the axis center of the clamp body (1), and a rivet (24) is fixed in the fixing hole (23).

10. The sleeve-type workpiece traveling fixture for the flexible automated electrical machining production line according to claim 9, characterized in that: The pull pin (24), the zero-point positioning sheet (25) and the supporting foot (26) arranged at the rear end of the base (2) form a zero-point positioning mechanical interface of the accompanying clamp, so that the online robot gripper can grasp the pull pin (24) for online transmission and automatically clamp, position or detach it from the automatic clamping plate on the production line.

11. The sleeve-type workpiece traveling fixture for the flexible automated electrical machining production line according to claim 10, characterized in that: Two groups of adjustment holes (21) are provided on the circumference of the base (2) at 90 degrees to each other. Self-aligning screws (22) are screwed into the adjustment holes (21). The self-aligning screws (22) push against the circumferential surface of the clamp body (1) to adjust the coaxiality between the axis of the clamp body (1) and the zero-point positioning center axis of the base (2).

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