A thin-walled part clamp with a centripetal angle positioning

Abstract

The present application relates to a kind of thin-walled part clamps with centripetal angle positioning.The present application includes clamp body;Chuck is connected to the clamp body, the chuck includes chuck body and the multiple clamping jaws that are distributed circumferentially along the upper end of the chuck body;Clamping jaw drive mechanism is provided in the clamp body, the clamping jaw drive mechanism is used to drive multiple the clamping jaw contraction or open, to clamp or loosen workpiece, the workpiece includes cylindrical surface and at least one angular feature and multiple positioning bosses provided on the cylindrical surface;Angular positioning mechanism, the angular positioning mechanism includes angular positioning seat connected to the clamp body and located on the side of the chuck, angular positioning cylinder connected with the angular positioning seat and angular positioning plate connected with the telescopic end of the angular positioning cylinder.The present application realizes accurate positioning of thin-walled part and improves the machining quality of workpiece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of clamps, in particular to a thin-walled part clamp with centripetal angular positioning. BACKGROUND

[0002] With the continuous development of the mechanical industry, the lightweight improvement of products is becoming more and more popular. As an important measure of lightweight, aluminum alloy is used more and more widely as a light and high-strength material. The wall thickness of aluminum alloy die casting blank is getting thinner and thinner, the shape is getting more and more complex, and the processing requirements of the finished product are getting higher and higher. When machining on a turning-milling combined machining equipment or a machining center, the part needs to be accurately positioned. In machining, the inner cylindrical surface (or outer cylindrical surface) of the part and an angular feature are often used for positioning. If the angular feature of the part is a non-parallel feature, for example, a right angle, the right angle will produce a radial component force towards the cylindrical surface of the part when it is centered and positioned. This component force interferes with the action of the cylindrical centering mechanism of the clamp, resulting in inaccurate positioning:

[0003] If the cylindrical centering mechanism of the clamp acts first, the angular positioning mechanism generally cannot push the workpiece for angular positioning; if the angular positioning mechanism of the clamp acts first, the radial component force generated by the angular positioning mechanism pushes the workpiece away from the cylindrical centering mechanism of the clamp, and when the cylindrical positioning mechanism acts subsequently, the cylindrical centering mechanism pushes the workpiece, forcing the angular positioning mechanism that has been extended to retreat until the center of the cylindrical surface of the workpiece is coaxial with the cylindrical centering mechanism of the clamp. In the case of a hydraulic system main oil way with a pressure retaining one-way valve, the angular positioning mechanism that has been extended may not be able to completely retract to the position, thereby causing deformation of the part and damaging the positioning accuracy of the part. Therefore, this positioning often uses a synchronous action mode of the cylindrical centering mechanism and the angular positioning mechanism of the clamp. This mode also has the problem of inaccurate positioning. Therefore, a new type of mechanism and control mode is needed. SUMMARY

[0004] To this end, the present application provides a thin-walled part clamp with centripetal angular positioning to realize accurate positioning and pressing of the thin-walled part and improve the machining quality of the workpiece.

[0005] To solve the above technical problems, the present application provides a thin-walled part clamp with centripetal angular positioning, comprising:

[0006] a clamp body;

[0007] a chuck connected to the clamp body, the chuck comprising a chuck body and a plurality of clamping jaws distributed circumferentially along the upper end of the chuck body;

[0008] A jaw driving mechanism is arranged in the clamp body, and is used to drive the plurality of jaws to contract or expand, so as to clamp or release the workpiece, wherein the workpiece comprises a cylindrical surface and at least one angular feature and a plurality of positioning bosses arranged on the cylindrical surface.

[0009] An angular positioning mechanism comprises an angular positioning seat connected to the clamp body and arranged beside the chuck, an angular positioning cylinder connected to the angular positioning seat, and an angular positioning plate connected to the telescopic end of the angular positioning cylinder.

[0010] When the angular positioning cylinder is extended, the angular positioning plate can push the workpiece to a first position in contact with the jaws by being in contact with the angular feature, and the positioning bosses are clamped by the jaws to make the workpiece in a second position. When the workpiece moves from the first position to the second position, the angular feature pushes the angular positioning cylinder to retract.

[0011] In an embodiment of the present application, the angular positioning cylinder further comprises a cylinder body, an end cover, a piston rod, a spring, a collar and a tail cover. The end cover and the tail cover are connected to the two ends of the cylinder body respectively, and a stepped hole for the piston rod to pass through is arranged axially along the cylinder body. The middle part of the piston rod is connected with a piston which is slidably connected to the stepped hole. An oil inlet cavity is formed between the piston and the end cover. One end of the spring is in abutment with one end of the piston rod, and the other end of the spring is connected with the tail cover. The other end of the piston rod passes through the side wall of the angular positioning seat and is connected with the angular positioning plate.

[0012] In an embodiment of the present application, the angular positioning cylinder further comprises a collar. The other end of the spring is connected with a steel ball through the collar. The tail cover is connected with an adjusting screw and a nut connected with the adjusting screw. The adjusting screw is in abutment with the steel ball.

[0013] In an embodiment of the present application, the angular positioning mechanism comprises a bushing and a guide rod. One end of the guide rod is telescopically connected to the side wall of the angular positioning seat through the bushing, and the other end of the guide rod is connected with the angular positioning plate.

[0014] In an embodiment of the present application, a supporting seat is arranged at the center of the upper end of the chuck body, and a plurality of chuck claws are arranged circumferentially on the supporting seat. The jaw driving mechanism comprises a linear oil cylinder connected to the lower end of the chuck body. The piston rod of the linear oil cylinder drives the pull rod of the chuck to move, so that the chuck claws contract or expand, and the clamping or releasing of the jaws is driven by the chuck claws.

[0015] In an embodiment of the present application, the angular positioning plate is provided with a positioning groove matched with the angular feature.

[0016] In one embodiment of the present application, the angular positioning plate can generate a radial force towards the cylindrical surface when it extends and contacts with the angular feature.

[0017] In one embodiment of the present application, the hydraulic control system of the clamp further comprises an oil source, a reversing valve, a first hydraulic station side quick connector, a first clamp side quick connector, a first hydraulic control check valve, a first check valve, a second check valve, a fourth check valve, a third check valve, a check sequence valve, a second clamp side quick connector, a second hydraulic station side quick connector, the oil source is connected with the oil inlet of the reversing valve, the first working position of the reversing valve is connected with the first hydraulic station side quick connector, the first clamp side quick connector, the hydraulic control check valve, a pressure gauge, an accumulator, the first check valve and the rod cavity of the linear oil cylinder in sequence, the second working position of the reversing valve is connected with the second hydraulic station side quick connector, the second clamp side quick connector, the check sequence valve, the second check valve and the rodless cavity of the linear oil cylinder in sequence, the hydraulic control check valve is connected between the second clamp side quick connector and the check sequence valve, the third check valve, the fourth check valve and the oil inlet cavity of the angular positioning cylinder in sequence.

[0018] In one embodiment of the present application, a pressure gauge and an accumulator are further arranged between the hydraulic control check valve and the first reversing valve.

[0019] In one embodiment of the present application, the reversing valve is a two-position four-way electromagnetic valve.

[0020] The above technical solution of the present application has the following advantages compared with the prior art:

[0021] The thin-wall part clamp with centripetal angular positioning provided by the present application can adjust the angular positioning through the single-acting oil cylinder with adjustable extension force, reduce the deformation of the workpiece, eliminate the movement interference between the workpiece and the angular positioning mechanism when the chuck is positioned and clamped, ensure the correct positioning and clamping of the workpiece, ensure the connection and disconnection of the clamp subsystem with the hydraulic station through the reasonable selection of the reversing valve form, ensure the pressure preservation of the system through the setting of the hydraulic control check valve, ensure that the workpiece is in the center of the chuck after the workpiece is loosened, and ensure the appropriate material taking position. The present application can adapt to the angle difference of the pressing surface of the workpiece to realize the accurate positioning and pressing of the thin-wall part and improve the machining quality of the workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to the specific embodiments of the present application and in combination with the drawings.

[0023] Figure 1is the structural schematic diagram of the clamp of the present application.

[0024] Figure 2 is the structural schematic diagram of the clamp of the present application after the clamp is virtualized.

[0025] Figure 3 is the structural schematic diagram of the present application after the workpiece is loaded in place.

[0026] Figure 4 is the external schematic diagram after the angular positioning mechanism acts (the workpiece deviates from the center of the chuck).

[0027] Figure 5 is the clamping schematic diagram after the workpiece is completely positioned (the workpiece returns to the center of the chuck).

[0028] Figure 6 is the cross-sectional schematic diagram of the angular positioning mechanism.

[0029] Figure 7 is the cross-sectional schematic diagram of the angular positioning oil cylinder.

[0030] Figure 8 is the schematic diagram of the hydraulic control system of the clamp.

[0031] Explanation of the reference signs in the attached drawings:

[0032] 1, clamp body; 2, chuck; 3, support seat; 4, angular positioning seat; 5, bushing; 6, guide rod; 7, angular positioning cylinder; 8, angular positioning plate; 9, clamping jaw; 10, straight oil cylinder;

[0033] 7.1, cylinder body; 7.2, end cover; 7.3, piston rod; 7.4, spring; 7.5, collar; 7.6, steel ball; 7.7, tail cover; 7.8, nut; 7.9, adjusting screw;

[0034] 11, oil source; 12, reversing valve; 12.1, left electromagnetic iron; 12.2, right electromagnetic iron; 13, first hydraulic station side quick connector; 14, first clamp side quick connector; 15, hydraulic control check valve; 16, pressure gauge; 17, accumulator; 18, first check valve; 19, second check valve; 20, fourth check valve; 21, third check valve; 22, check sequence valve; 23, second clamp side quick connector; 24, second hydraulic station side quick connector. DETAILED DESCRIPTION

[0035] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not limiting to the present application.

[0036] In the present application, if there is a description of direction (up, down, left, right, front and back), it is only for the convenience of describing the technical solutions of the present application, and is not intended to indicate or imply that the indicated technical features must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "more than" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In the description of the present application, if there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0038] In the present application, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood, for example, they can be directly connected, or indirectly connected through an intermediate medium; can be fixedly connected, or can be detachably connected, or can be integrally formed; can be mechanically connected, or can be electrically connected or capable of communicating with each other; can be the communication or interaction relationship between two elements or the interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solutions.

[0039] Referring to Figure 1 , Figure 2 A thin-walled part clamp with a centripetal angular positioning, as shown in the drawings, comprises:

[0040] A clamp body 1;

[0041] A chuck 2 connected to the clamp body 1, the chuck 2 comprising a chuck 2 body and a plurality of clamping jaws 9 distributed circumferentially along the upper end of the chuck 2 body;

[0042] A clamping jaw 9 driving mechanism provided on the clamp body 1, the clamping jaw 9 driving mechanism being used to drive the plurality of clamping jaws 9 to contract or expand, so as to clamp or release a workpiece, the workpiece comprising a cylindrical surface and at least one angular feature and a plurality of positioning bosses provided on the cylindrical surface;

[0043] An angular positioning mechanism, the angular positioning mechanism comprising an angular positioning seat 4 connected to the clamp body 1 and located beside the chuck 2, an angular positioning cylinder 7 connected to the angular positioning seat 4, and an angular positioning plate 8 connected to the extension end of the angular positioning cylinder 7;

[0044] When the angular positioning cylinder 7 extends, the angular positioning plate 8 can push the workpiece to a first position in contact with the clamping jaw 9 by contacting the angular feature, and the workpiece is in a second position by the clamping jaw 9 shrinking to clamp the positioning boss, and the angular feature pushes the angular positioning cylinder 7 to retract during the movement of the workpiece from the first position to the second position.

[0045] Specifically, the angular positioning plate 8 is provided with a positioning groove matched with the angular feature, and when the angular positioning plate 8 extends and is in contact with the angular feature, a radial force towards the cylindrical surface can be generated on the workpiece.

[0046] Through the above arrangement, when the angular positioning plate 8 moves to angularly position the workpiece, a force towards the center of the chuck 2 is generated, so that the workpiece moves away from the center of the chuck 2 until it contacts the clamping jaw 9 and stops, at this time, it is in the first position. Then, the chuck 2 clamping jaw shrinks inward to position and clamp the positioning boss of the workpiece, and the clamping jaw 9 forces the workpiece to move to the center of the chuck 2, and the angular feature of the workpiece pushes the angular positioning plate 8 to retract. During this process, the angular positioning plate 8 always contacts the positioning feature of the workpiece to ensure the angular positioning of the workpiece, until the workpiece is in the center position in the chuck 2 (i.e. the second position), and the positioning and clamping process of the workpiece is completed.

[0047] Referring to Figure 7 The angular positioning cylinder 7 further includes a cylinder body 71, an end cover 72, a piston rod 73, a spring 74, a sleeve ring 75, and a tail cover 77. The end cover 72 and the tail cover 77 are connected to the two ends of the cylinder body 71, respectively, and are provided with a stepped hole for the piston rod 73 to pass through in the axial direction of the cylinder body 71. The middle part of the piston rod 73 is connected with a piston which is slidingly connected to the stepped hole. An oil inlet cavity is formed between the piston and the end cover 72. One end of the spring 74 abuts against one end of the piston rod 73, and the other end of the spring 74 is connected to the tail cover 77. The other end of the piston rod 73 passes through the side wall of the angular positioning seat 4 and is connected to the angular positioning plate 8.

[0048] Please refer to Figure 7 The angular positioning cylinder 7 further includes a sleeve ring 75, and a steel ball 76 connected to the other end of the spring 74 through the sleeve ring 75. The tail cover 77 is connected with an adjusting screw 79 and a nut 78 connected to the adjusting screw 79. The adjusting screw 79 abuts against the steel ball 76. In this embodiment, the steel ball 76 is embedded in the blind hole of the sleeve ring 75.

[0049] With the above configuration, the angular positioning cylinder 7 is a single-acting structure. After oil enters the oil inlet chamber on the left side of the angular positioning cylinder 7, the piston rod 73 retracts. After the oil inlet chamber on the left side of the angular positioning cylinder 7 is depressurized, the spring 74 pushes the piston rod 73 to extend outward. The adjusting screw 79 is used to adjust the compression of the spring 74, thereby adjusting the thrust when the piston rod 73 extends. After each adjustment, the adjusting screw 79 is tightened by tightening the nut 78 to prevent the adjusting screw 79 from loosening.

[0050] Specifically, refer to Figure 2 , Figure 6 As shown, the angular positioning mechanism includes a bushing 5 and a guide rod 6. One end of the guide rod 6 is telescopically connected to the side wall of the angular positioning seat 4 through the bushing 5, and the other end of the guide rod 6 is connected to the angular positioning plate 8.

[0051] Specifically, the upper center of the chuck 2 body is provided with a support seat 3, and a plurality of jaws are circumferentially arranged on the support seat 3. The jaw 9 driving mechanism includes a linear hydraulic cylinder 10 connected to the lower end of the chuck 2 body. The piston rod 73 of the linear hydraulic cylinder 10 drives the pull rod of the chuck 2 to move, so that the jaws of the chuck 2 contract or open, and drives the jaws 9 to clamp or release through the jaws.

[0052] The sequence of operations for this thin-walled part fixture with angular positioning is as follows:

[0053] In the initial state, the jaws of the chuck 2 are in the open state, and the piston rod 73 of the angular positioning cylinder 7 is in the retracted state. Figure 3 (As shown). The robot places the workpiece in the correct position on the fixture. The rod chamber of the angular positioning cylinder 7 is depressurized, and the piston rod 73 of the angular positioning cylinder extends under the action of the spring 74, driving the angular positioning cylinder forward to perform angular positioning of the workpiece. Because there is a component force towards the center of the chuck 2 during angular positioning of the workpiece, the workpiece deviates from the center position of the chuck 2, moves to the left, and stops when it contacts the gripper 9 (as shown). Figure 4 (As shown). Then, oil enters the rod chamber of the linear cylinder 10, and the piston rod 73 of the linear cylinder 10 drives the pull rod of the chuck 2 to move downwards, causing the jaws of the chuck 2 to retract inwards, thus clamping the workpiece onto the lower positioning boss of the workpiece with the gripper 9. The gripper 9 forces the workpiece to move towards the center position of the chuck 2. The angular feature of the workpiece pushes the angular positioning plate 8, which in turn forces the piston rod 73 of the angular positioning cylinder 7 to move to the right, compressing the spring 74. The piston rod 73 retracts. During this process, the angular positioning plate 8 remains in contact with the positioning feature of the workpiece, ensuring angular positioning of the workpiece, until the workpiece is in the center position in the chuck 2, at which point the workpiece positioning and clamping process ends (as shown). Figure 5 (As shown).

[0054] After the machining is finished, the workpiece is loosened. The workpiece is taken away by a hand or a mechanical hand. In a sequential action mode, the angular positioning cylinder 7 is retracted first, and then the chuck 2 is opened. The workpiece is ensured to be in the center position of the chuck 2, so that the mechanical hand can smoothly grab the workpiece.

[0055] The thin-walled part clamp with angular positioning can adopt a continuous oil supply mode and be directly controlled by a machine tool, or adopt an external oil supply mode and be supplied with oil by an external hydraulic station. At this time, the hydraulic control system of the clamp should be set to a pressure maintaining structure.

[0056] Referring to Figure 8 Fig. 1, an external oil supply mode is taken as an example, and the clamp hydraulic control system comprises an oil source 11, a reversing valve 12, a first hydraulic station side quick connector 13, a first clamp side quick connector 14, a hydraulic control check valve 15, a first check valve 18, a second check valve 19, a fourth check valve 20, a third check valve 21, a check sequence valve 22, a second clamp side quick connector 23, and a second hydraulic station side quick connector 24. The oil source 11 is connected with an oil inlet end of the reversing valve 12. A first working position of the reversing valve 12 is connected with the first hydraulic station side quick connector 13, the first clamp side quick connector 14, the hydraulic control check valve 15, a pressure gauge 16, an accumulator 17, the first check valve 18, and a rod cavity of the linear oil cylinder 10 in sequence. A second working position of the reversing valve 12 is connected with the second hydraulic station side quick connector 24, the second clamp side quick connector 23, the check sequence valve 22, the second check valve 19, and a rodless cavity of the linear oil cylinder 10 in sequence. The hydraulic control check valve 15 is connected with the second clamp side quick connector 23 and the check sequence valve 22, the third check valve 21, the fourth check valve 20, and an oil inlet cavity of the angular positioning cylinder 7 in sequence.

[0057] Specifically, the hydraulic control check valve 15 and the first reversing valve 12 are further provided with the pressure gauge 16 and the accumulator 17. The reversing valve 12 is a two-position four-way electromagnetic valve.

[0058] The oil source 11 is used to provide pressure oil to the clamp. The reversing valve 12 is used to reverse so that the clamp can loosen and press the workpiece. The hydraulic control check valve 15 is used to maintain pressure. The pressure gauge 16 is used to display the pressure in the system in real time, which is convenient for the operator to understand the pressure change in the system. The accumulator 17 is used to make up for the pressure loss in the system due to internal or external leakage of the oil, and to suppress the pressure fluctuation in the system. The first one-way throttle valve 18 and the second one-way throttle valve 19 are respectively used to adjust the speed of the piston rod 73 of the linear oil cylinder 10 to extend and retract. The fourth one-way throttle valve 20 and the third one-way throttle valve 21 are respectively used to adjust the speed of the piston rod 73 of the angular positioning cylinder 7 to extend and retract. The first clamp side quick plug connector 14 and the second clamp side quick plug connector 23 correspond to the first hydraulic station side quick connector 13 and the second hydraulic station side quick connector 24 respectively, and are used to quickly connect or disconnect the hydraulic station and the clamp sub-hydraulic system.

[0059] The control during the machining cycle is as follows:

[0060] In the initial state, the chuck 2 is in the open state, and the piston rod 73 of the angular positioning cylinder 7 is in the retracted state. That is, the first hydraulic station side quick connector 13 and the first clamp side quick plug connector 14 are in the docking state, and the second hydraulic station side quick connector 24 and the second clamp side quick plug connector 23 are also in the docking state. At the same time, the right electromagnetic iron 122 of the reversing valve 12 is in the powered state, and the right side of the reversing valve 12 is connected.

[0061] After the workpiece is loaded in place, the right electromagnetic iron 122 of the reversing valve 12 loses power, and the reversing valve 12 switches to the middle pressure relief position. The left oil cavity of the angular positioning cylinder 7 is relieved of oil, and the spring 74 pushes the piston rod 73 to the left. The workpiece is angularly positioned. The oil in the left oil cavity of the angular positioning cylinder 7 is drained back to the oil tank through the main valve throttle of the fourth one-way throttle valve 20, the one-way valve of the third one-way throttle valve 21, the second clamp side quick connector 23, the second hydraulic station side quick connector 24, and the right position of the reversing valve 12. After the right electromagnetic iron 122 of the reversing valve 12 loses power for a certain period of time, the left electromagnetic iron 121 of the reversing valve 12 is powered on, the reversing valve 12 switches to the left position, and the pressure oil of the oil source 11 passes through the left position of the reversing valve 12, the first hydraulic station side quick connector 13, the first clamp side quick connector 14, and the open hydraulic control one-way valve 15, passes through the one-way valve of the first one-way throttle valve 18, enters the rod cavity of the linear oil cylinder 10, and drives the piston rod 73 of the linear oil cylinder 10 to retract. The oil in the rodless cavity of the linear oil cylinder 10 is drained back to the oil tank through the main valve throttle of the second one-way throttle valve 19, the one-way valve of the one-way sequence valve 22, and the left position of the reversing valve 12. The piston rod 73 of the linear oil cylinder 10 moves downward, driving the pull rod of the chuck 2, causing the clamping jaw 9 of the chuck 2 to retract synchronously, and driving the clamping jaw 9 to position and clamp the lower positioning flange of the workpiece. The clamping jaw 9 drives the workpiece to move to the center position of the chuck 2. The angular features of the workpiece force the piston rod 73 of the angular positioning cylinder 7 to retract. Until the positioning flange of the workpiece is in the center position of the chuck 2. The positioning and clamping of the workpiece is completed. Then, the oil pressure on the rod cavity side of the linear oil cylinder 10 rises and supplies oil to the accumulator 17 until the pressure of the clamp system is consistent with the pressure of the oil source 11. The hydraulic control one-way valve 15 is closed under the action of the internal spring 74. The system is in a pressure maintaining state. Then, the left electromagnetic iron 121 of the reversing valve 12 loses power, and the reversing valve 12 switches to the middle position, and the system is relieved of pressure. The first hydraulic station side quick connector 13 is separated from the first clamp side quick connector 14, and the second hydraulic station side quick connector 24 is separated from the second clamp side quick connector 23. The machine tool starts processing.

[0062] After the machining is finished, the first hydraulic station side quick connector 13 is connected with the first clamp side quick connector 14 manually, and the second hydraulic station side quick connector 24 is connected with the second clamp side quick connector 23. Then, the right electromagnetic iron 122 of the reversing valve 12 is electrified, and the right position of the reversing valve 12 is connected. The pressure oil of the oil source 11 passes through the right position of the reversing valve 12, is throttled by the main valve of the third one-way throttle valve 21, passes through the one-way valve of the fourth one-way throttle valve 20, and enters the left oil cavity of the angular positioning cylinder 7, so as to drive the piston rod 73 of the angular positioning cylinder 7 to retract. One branch of the pressure oil enters the control port of the hydraulic control one-way valve 15, opens the main valve of the hydraulic control one-way valve 15, and is blocked at the one-way sequence valve 22. After the piston rod 73 of the angular positioning cylinder 7 is retracted to the position, the oil pressure of the branch rises, the oil pressure rises to the set pressure of the one-way sequence valve 22, the main valve of the one-way sequence valve 22 is opened, the pressure oil passes through the main valve of the one-way sequence valve 22 and the one-way valve of the second one-way throttle valve 19, enters the rodless cavity of the straight-line oil cylinder 10, drives the piston rod 73 of the straight-line oil cylinder 10 to extend, drives the clamping jaw 9 of the chuck 2 to open, and the clamping jaw 9 is opened. The oil in the rod cavity of the straight-line oil cylinder 10 is throttled by the one-way throttle valve, passes through the main valve of the hydraulic control one-way valve 15, and flows back to the oil tank from the right position of the reversing valve 12. The pressure oil in the accumulator 17 also flows back to the oil tank from the right position of the reversing valve 12.

[0063] At this time, the workpiece is kept at the center position of the chuck 2. The manipulator is moved to the workpiece position, and the machined workpiece is taken away. The loosening cycle is finished.

[0064] If the machine tool directly supplies oil, the control method is the same, and only the operation of connecting and disconnecting the quick connector is omitted. The hydraulic control one-way valve 15, the accumulator 17 and the pressure gauge 16 can be retained or cancelled according to actual needs.

[0065] Finally, it should be explained that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application is described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A thin-walled part fixture with centripetal positioning, characterized in that, include: Clamping body (1); A chuck (2) is connected to the clamp body (1). The chuck (2) includes a chuck (2) body and a plurality of jaws (9) distributed circumferentially along the upper end of the chuck (2) body. A gripper (9) driving mechanism is provided on the clamp body (1). The gripper (9) driving mechanism is used to drive multiple grippers (9) to retract or open to clamp or release the workpiece. The workpiece includes a cylindrical surface and at least one angular feature and multiple positioning bosses provided on the cylindrical surface. An angular positioning mechanism, comprising an angular positioning seat (4) connected to the clamp body (1) and located beside the chuck (2), an angular positioning cylinder (7) connected to the angular positioning seat (4), and an angular positioning plate (8) connected to the telescopic end of the angular positioning cylinder (7). When the angular positioning cylinder (7) extends, the angular positioning plate (8) can push the workpiece to a first position that contacts the gripper (9) by contacting and engaging with the angular feature. The gripper (9) retracts and clamps the positioning boss, so that the workpiece is in a second position. When the workpiece moves from the first position to the second position, the angular feature pushes the angular positioning cylinder (7) to retract. The angular positioning cylinder (7) also includes a cylinder body (71), an end cap (72), a piston rod (73), a spring (74), a collar (75), and a tail cap (77). The end cap (72) and the tail cap (77) are respectively connected to the two ends of the cylinder body (71). A stepped hole is provided along the axial direction of the cylinder body (71) for the piston rod (73) to pass through. A piston that is slidably connected to the stepped hole is connected to the middle of the piston rod (73). An oil inlet chamber is formed between the piston and the end cap (72). One end of the spring (74) abuts against one end of the piston rod (73). The other end of the spring (74) is connected to the tail cap (77). The other end of the piston rod (73) passes through the side wall of the angular positioning seat (4) and is connected to the angular positioning plate (8). The angular positioning cylinder (7) also includes a collar (75), and the other end of the spring (74) is connected to a steel ball (76) through the collar (75). The tail cap (77) is connected to an adjusting screw (79) and a nut (78) connected to the adjusting screw (79). The adjusting screw (79) abuts against the steel ball (76). The angular positioning mechanism includes a bushing (5) and a guide rod (6). One end of the guide rod (6) is telescopically connected to the side wall of the angular positioning seat (4) through the bushing (5), and the other end of the guide rod (6) is connected to the angular positioning plate (8). The angular positioning plate (8) is provided with a positioning groove that matches the angular feature; When the angular positioning plate (8) extends out and contacts the angular feature, it can generate a radial component force toward the cylindrical surface on the workpiece.

2. A thin-walled part fixture with centripetal angular positioning according to claim 1, characterized in that, The chuck (2) has a support seat (3) at the center of the upper end of its body, and multiple jaws are arranged circumferentially on the support seat (3). The jaw (9) driving mechanism includes a linear cylinder (10) connected to the lower end of the chuck (2) body. The piston rod (73) of the linear cylinder (10) drives the pull rod of the chuck (2) to move, so that the jaws of the chuck (2) contract or open, and the jaws drive the clamping or loosening of the jaw (9).

3. A thin-walled part fixture with centripetal angular positioning according to claim 2, characterized in that, It also includes a clamp hydraulic control system, which includes an oil source (11), a reversing valve (12), a first hydraulic station side quick connector (13), a first clamp side quick connector (14), a hydraulic control check valve (15), a first one-way throttle valve (18), a second one-way throttle valve (19), a fourth one-way throttle valve (20), a third one-way throttle valve (21), a one-way sequence valve (22), a second clamp side quick connector (23), and a second hydraulic station side quick connector (24). The oil source (11) is connected to the oil inlet of the reversing valve (12), and the first working position of the reversing valve (12) is sequentially connected to the first hydraulic station side quick connector (13) and the first clamp. The quick-connect connector (14), hydraulic check valve (15), pressure gauge (16), accumulator (17), first one-way throttle valve (18) and rod chamber of the linear cylinder (10) are connected in sequence. The second working position of the directional valve (12) is connected in sequence to the second hydraulic station side quick connector (24), second clamp side quick connector (23), one-way sequence valve (22), second one-way throttle valve (19) and rodless chamber of the linear cylinder (10). The hydraulic check valve (15) is connected in sequence between the second clamp side quick connector (23) and one-way sequence valve (22), third one-way throttle valve (21), fourth one-way throttle valve (20) and oil inlet chamber of the angular positioning cylinder (7).

4. A thin-walled part fixture with centripetal angular positioning according to claim 3, characterized in that, A pressure gauge (16) and an accumulator (17) are also provided between the hydraulic control check valve (15) and the reversing valve (12).

5. A thin-walled part fixture with centripetal angular positioning according to claim 3, characterized in that, The reversing valve (12) is a two-position four-way solenoid valve.

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