Box type workpiece clamping, positioning and rotating device and using method

Abstract

The invention provides a box type workpiece clamping, positioning and rotating device and a using method. The box type workpiece clamping, positioning and rotating device comprises an upper flat plate and a lower flat plate. The upper flat plate and the lower flat plate can be connected in a relatively rotating mode, the center of the upper flat plate is hinged to the center of the lower flat plate through a hinge rod, a plurality of vertical positioning sleeves are evenly arranged on the lower flat plate, and a plurality of positioning holes corresponding to the positioning sleeves one to one are formed in the upper flat plate. A positioning steel ball, a positioning spring, a steel ball ejector rod and a fastener are arranged in the positioning hole, the positioning steel ball is in contact with the top end of the positioning sleeve, and the positioning spring, the steel ball ejector rod and the fastener are used for pressing the positioning steel ball; a first n-shaped supporting frame and a second n-shaped supporting frame are arranged on the upper flat plate. The problem that the production efficiency is low due to the fact that secondary clamping is needed in the machining process of irregular box type workpieces is solved, meanwhile, the rotating angle can be accurately controlled, and the machining requirements of various different angles are met.

Description

Technical Field

[0001] The invention belongs to the technical field of box clamping devices, and particularly relates to a clamping, positioning and rotating device for box-shaped workpieces and a using method thereof. Background Art

[0002] The statements in this part only provide background technical information related to the present invention, and do not necessarily constitute prior art.

[0003] In the current field of machining, for boring machines and machining centers without rotation functions, the clamping and positioning devices for box-shaped workpieces mostly rely on the center hole positioning method. Many drawbacks of this traditional positioning method are exposed in the rotation process. When machining other end faces of the workpiece, it is often necessary to re-clamp the workpiece. Frequent re-clamping not only greatly reduces work efficiency, but also it is difficult to guarantee the accuracy of box-shaped workpieces during the secondary clamping process, easily causing problems such as dimensional deviation. At the same time, workers need to perform clamping operations repeatedly, and the labor intensity increases significantly, further restricting the improvement of production efficiency.

[0004] The prior art patent number CN222696538U discloses a positioning and clamping mechanism for machining of a cylindrical box with automatic commutation, which drives a lifting claw plate to rotate through a servo motor and a gear transmission wheel set, and theoretically can solve the problem of large labor intensity. However, in practical applications, the complex motor drive system and supporting transmission components increase the overall cost of the equipment. Although the rotation of the box can be realized, when clamping an irregular box, it is still necessary to loosen the box and then clamp it again during the rotation process, while for a regular circular box, it can be directly rotated. Therefore, the prior art still cannot meet the clamping requirements of irregularly shaped boxes. Summary of the Invention

[0005] Aiming at the above problems, the present invention provides a clamping, positioning and rotating device for box-shaped workpieces and a using method thereof, which solves the problem of low production efficiency caused by secondary clamping of irregular box-shaped workpieces during the machining process, and can accurately control the rotation angle to meet the machining requirements at various different angles.

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] In a first aspect, the present invention provides a clamping, positioning and rotating device for box-shaped workpieces, comprising: an upper flat plate and a lower flat plate; the upper flat plate and the lower flat plate are rotatably connected relative to each other, and the centers of the upper flat plate and the lower flat plate are hinged by a hinge rod. A plurality of vertical positioning sleeves are evenly arranged on the lower flat plate, and a plurality of positioning holes corresponding to the positioning sleeves one by one are arranged on the upper flat plate. A positioning steel ball, a positioning spring, a steel ball ejector rod and a fastener are arranged in the positioning holes. The positioning steel ball contacts the top end of the positioning sleeve to control the rotation angle between the upper flat plate and the lower flat plate, and the positioning spring, the steel ball ejector rod and the fastener are used to press the positioning steel ball tightly; A U-shaped first support frame and a second support frame are arranged on the upper flat plate for fixing box-shaped workpieces.

[0008] Further, a plurality of the positioning sleeves are evenly arranged on a circle with the hinge rod as the center, and the number of the positioning sleeves is determined according to the rotation accuracy of the positioning and rotating device.

[0009] Further, the lower end of the positioning spring contacts the positioning steel ball, the upper end of the positioning spring contacts one end of the steel ball ejector rod, and the other end of the steel ball ejector rod contacts the fastener, thereby pressing the positioning steel ball tightly.

[0010] Further, an annular rolling groove with the hinge rod as the center is arranged on the upper surface of the lower flat plate, and a plurality of rolling steel balls are arranged at positions corresponding to the rolling groove on the lower surface of the upper flat plate to assist the rotation between the upper flat plate and the lower flat plate.

[0011] Further, an inverted T-shaped ring groove is arranged on the upper surface of the lower flat plate, a T-shaped connecting piece is arranged in the inverted T-shaped ring groove, and the T-shaped connecting piece is connected to the upper flat plate through a through hole on the upper flat plate. The upper flat plate and the lower flat plate are fixed by tightening the T-shaped connecting piece; The T-shaped connecting piece is fixed to the upper flat plate by a nut, and a washer is arranged between the nut and the upper flat plate. The washer is a flat washer or a spring washer.

[0012] Further, a positioning seat is arranged at the center position of the upper flat plate. The positioning seat is fixed on the upper flat plate by the hinge rod, and a first positioning pin and a second positioning pin are arranged on the positioning seat for fixing box-shaped workpieces.

[0013] Further, the first support frame is composed of two long vertical rods and a first pressing plate. The bottom ends of the two long vertical rods are connected to the upper flat plate, and the line connecting the two connection points passes through the center of the circle at the hinge rod. The top ends of the two long vertical rods are connected to the first pressing plate, and a pressing round block is arranged on the lower surface of the first pressing plate for pressing the box-shaped workpiece onto the positioning seat.

[0014] Further, the second support frame is composed of two short vertical rods and a second pressing plate. The bottoms of the two short vertical rods are connected to the upper flat plate, and the included angle between the line connecting the two connection points and the line connecting the bottoms of the two long vertical rods is 45 degrees, and it is set at a certain distance from the center of the hinge rod; the tops of the two short vertical rods are connected to the second pressing plate, and a pressing round block is also arranged on the lower surface of the second pressing plate to prevent the box-shaped workpiece from rotating around the pressing round block and the positioning seat on the first pressing plate.

[0015] Further, the upper flat plate is made of a circular steel plate, and a handle is arranged on the upper flat plate to complete the rotation of the positioning and rotating device. The lower flat plate is made of a square steel plate, and the four corners of the lower flat plate are fixedly installed on a machining center or a boring machine through fasteners; a tool setting block is arranged on one side of the lower flat plate.

[0016] In a second aspect, the present invention also provides a method for using a box-shaped workpiece clamping, positioning and rotating device, including the following steps:

[0017] S1. Fix the lower flat plate on a machining center or a boring machine through the fasteners at its four corners; the lower flat plate is a square steel plate, and it is necessary to ensure its stability and accurate position during installation; a tool setting block is arranged on one side of the lower flat plate, which can be used for tool setting operation during subsequent processing.

[0018] S2. Place the box-shaped workpiece on the positioning seat of the upper flat plate, and use the first positioning pin and the second positioning pin on the positioning seat to perform preliminary positioning on the workpiece; connect the bottoms of the two long vertical rods to the upper flat plate, and the line connecting the connection points passes through the center of the hinge rod; adjust the first pressing plate so that the pressing round block on the lower surface of the pressing plate presses the box-shaped workpiece on the positioning seat; connect the bottoms of the two short vertical rods to the upper flat plate; adjust the second pressing plate so that the pressing round block on the lower surface of the pressing plate prevents the box-shaped workpiece from rotating around the pressing round block and the positioning seat on the first pressing plate.

[0019] S3. When adjusting the processing angle of the workpiece, first loosen the T-shaped connecting piece; loosening the nut can release the fixation.

[0020] Push the upper flat plate to rotate around the hinge rod through the handle.

[0021] When rotating to the required angle, the positioning steel ball will fall into the top of the positioning sleeve at the corresponding position of the lower flat plate under the action of the positioning spring, the steel ball ejector rod and the fastener, so as to control the rotation angle between the upper flat plate and the lower flat plate and complete the angle positioning.

[0022] S4. After the angle adjustment is completed, tighten the T-shaped connecting piece again to fix the upper flat plate and the lower flat plate to prevent the device from rotating during processing; according to the processing requirements, use a machining center or a boring machine, and combine the tool setting block on one side of the lower flat plate to perform tool setting operation, and then process the clamped box-shaped workpiece.

[0023] After the processing is completed, loosen the pressing plates of the first support frame and the second support frame, release the pressing state of the box-shaped workpiece, remove the workpiece from the positioning seat, and complete the entire usage process.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0025] The positioning and rotating device of the present invention can precisely control the rotation angle through the relative rotational connection between the upper flat plate and the lower flat plate, and the cooperation between the positioning steel balls and the positioning sleeves to control the rotation angle, meeting the processing requirements of various different angles; the number of positioning sleeves can be determined according to the rotation accuracy, further improving the flexibility and accuracy of angle adjustment, and enhancing the diversity and adaptability of processing; through the unique structure and pressing method of the first and second support frames, the box-shaped workpiece can be firmly and precisely positioned on the upper flat plate, greatly improving the accuracy of clamping and positioning, thus ensuring the processing accuracy of the box-shaped workpiece and reducing the rejection rate.

[0026] The positioning and rotating device of the present invention preliminarily positions the workpiece through the first positioning pin and the second positioning pin on the positioning seat, and then uses the pressing circular blocks of the first support frame and the second support frame to respectively realize the pressing of the workpiece and prevent it from rotating around a specific point, effectively solving the clamping and positioning problem of the box-shaped workpiece; the operation process of the positioning and rotating device is simple, the clamping and angle adjustment are convenient, the fixing and loosening of the upper flat plate and the lower flat plate can be realized by loosening and tightening the T-shaped connecting piece, and the upper flat plate is rotated by pushing the handle, and the whole process is convenient for the operator to complete quickly, effectively shortening the preparation time before processing and improving the processing efficiency.

[0027] The structural design of the lower flat plate of the positioning and rotating device of the present invention enables it to be stably installed on a machining center or a boring machine, and the setting of the tool setting block facilitates the tool setting operation during the processing, enabling the clamping, positioning and rotating device to closely cooperate with the processing equipment, ensuring the smooth progress of the processing process, and improving the overall processing quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0029] Figure 1 It is a front view cross-sectional view of the positioning and rotating device of the present invention;

[0030] Figure 2 It is a right view cross-sectional view of the positioning and rotating device of the present invention;

[0031] Figure 3 It is a top view cross-sectional view of the positioning and rotating device of the present invention.

[0032] In the figure: 1, positioning sleeve; 2, positioning steel ball; 3, positioning spring; 4, T-shaped connecting piece; 5, washer; 6, nut; 7, gasket; 8, screw; 9, steel ball ejector rod; 10, fastener seat; 11, fastener; 12, long vertical rod; 13, first pressing plate; 14, articulated rod; 15, rolling steel ball; 16, handle; 17, short vertical rod; 18, first positioning pin; 19, second positioning pin; 20, upper flat plate; 21, lower flat plate; 22, second pressing plate; 23, tool setting block. Specific implementation mode

[0033] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific implementation modes and are not intended to limit the exemplary implementation modes according to the present invention. As used herein, unless the present invention clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof;

[0035] Embodiment 1

[0036] This embodiment provides a clamping, positioning and rotating device for box-shaped workpieces. As Figures 1 - 3 shown, it includes: an upper flat plate 20 and a lower flat plate 21; the upper flat plate 20 and the lower flat plate 21 are rotatably connected relatively. The center of the upper flat plate 20 and the center position of the lower flat plate 21 are articulated through an articulated rod 14. A plurality of vertical positioning sleeves 1 are evenly arranged on the lower flat plate 21. The top of the positioning sleeve 1 is designed with a chamfer and is surface hardened to increase the wear resistance with the positioning steel ball 2; a plurality of positioning holes corresponding to the positioning sleeves 1 one by one are arranged on the upper flat plate 20. The positioning holes are provided with a positioning steel ball 2, a positioning spring 3, a steel ball ejector rod 9 and a fastener 11. The positioning steel ball 2 contacts the top end of the positioning sleeve 1 and is used to control the rotation angle between the upper flat plate 20 and the lower flat plate 21. The positioning spring 3, the steel ball ejector rod 9 and the fastener 11 are used to press the positioning steel ball 2 tightly; a U-shaped first support frame and a second support frame are arranged on the upper flat plate 20 for fixing box-shaped workpieces. When processing box-shaped workpieces, it is often necessary to adjust the processing angle. However, the existing devices have complex angle adjustment operations and it is difficult to accurately control the angle. The positioning and rotating device of the present invention can easily realize the relative rotation of the upper flat plate 20 and the lower flat plate 21. Through the cooperation of the positioning steel ball 2 and the positioning sleeve 1, the rotation angle can be accurately controlled to meet the processing requirements of various different angles.

[0037] Further, a plurality of the positioning sleeves 1 are uniformly arranged on a circle with the hinge rod 14 as the center, and the number of the positioning sleeves 1 is determined according to the rotation accuracy of the positioning and rotating device. The number of the positioning sleeves 1 can be determined according to the rotation accuracy, further improving the flexibility and accuracy of angle adjustment, and enhancing the diversity and adaptability of processing.

[0038] Further, the lower end of the positioning spring 3 is in contact with the positioning steel ball 2, the upper end of the positioning spring 3 is in contact with one end of the steel ball ejector rod 9, and the other end of the steel ball ejector rod 9 is in contact with the fastener 11, thereby pressing the positioning steel ball 2 tightly; the fastener 11 is installed on the fastener seat 10 at the upper end of the positioning hole, the fastener seat 10 is fixedly arranged on the upper flat plate 20 by screws 8, and a gasket 7 is further arranged between the fastener seat 10 and the upper flat plate 20.

[0039] Further, an annular rolling groove with the hinge rod 14 as the center is arranged on the upper surface of the lower flat plate 21, and a plurality of rolling steel balls 15 are arranged at the position corresponding to the rolling groove on the lower surface of the upper flat plate 20 for assisting the rotation between the upper flat plate 20 and the lower flat plate 21.

[0040] Further, an inverted T-shaped ring groove is arranged on the upper surface of the lower flat plate 21, a T-shaped connecting piece 4 is arranged in the inverted T-shaped ring groove, the T-shaped connecting piece 4 is connected with the upper flat plate 20 through a through hole on the upper flat plate 20, and the upper flat plate 20 and the lower flat plate 21 are fixed by tightening the T-shaped connecting piece 4; the T-shaped connecting piece 4 is fixed to the upper flat plate 20 by a nut 6, and a washer 5 is arranged between the nut 6 and the upper flat plate 20, and the washer 5 is a flat washer 5 or a spring washer 5. The operation process of the positioning and rotating device is simple and easy to understand, and steps such as clamping, angle adjustment and fixing are all relatively convenient; by loosening and tightening the T-shaped connecting piece 4, the fixing and loosening of the upper flat plate 20 and the lower flat plate 21 can be realized, and by pushing the upper flat plate 20 to rotate with the handle 16, the whole process is convenient for the operator to complete quickly, effectively shortening the preparation time before processing and improving the processing efficiency.

[0041] Further, a positioning seat is arranged at the center position of the upper flat plate 20, the positioning seat is fixed on the upper flat plate 20 through the hinge rod 14, and a first positioning pin 18 and a second positioning pin 19 are arranged on the positioning seat for fixing box-shaped workpieces. The workpiece is preliminarily positioned by the first positioning pin 18 and the second positioning pin 19 on the positioning seat, and then the first support frame and the second support frame are respectively used to press the workpiece and prevent it from rotating around a specific point, effectively solving the clamping and positioning problem of box-shaped workpieces.

[0042] Furthermore, the first support frame is composed of two long vertical rods 12 and a first pressing plate 13. The bottoms of the two long vertical rods 12 are connected to the upper flat plate 20, and the line connecting the two connection points passes through the center of the hinge rod 14. The tops of the two long vertical rods 12 are connected to the first pressing plate 13. A pressing round block is provided on the lower surface of the first pressing plate 13 for pressing the box-shaped workpiece against the positioning seat.

[0043] Furthermore, the second support frame is composed of two short vertical rods 17 and a second pressing plate 22. The bottoms of the two short vertical rods 17 are connected to the upper flat plate 20. The included angle between the line connecting the two connection points and the line connecting the bottoms of the two long vertical rods 12 is 45 degrees, and it is at a set distance from the center of the hinge rod 14. The tops of the two short vertical rods 17 are connected to the second pressing plate 22. A pressing round block is also provided on the lower surface of the second pressing plate 22 for preventing the box-shaped workpiece from rotating around the pressing round block on the first pressing plate 13 and the positioning seat.

[0044] Furthermore, the upper flat plate 20 is made of a circular steel plate. A handle 16 is provided on the upper flat plate 20 for rotating the positioning and rotating device. The lower flat plate 21 is made of a square steel plate. The four corners of the lower flat plate 21 are fixedly installed on a machining center or a boring machine through fasteners 11. A tool setting block 23 is provided on one side of the lower flat plate 21. The structural design of the lower flat plate 21 of the positioning and rotating device enables it to be stably installed on a machining center or a boring machine. The provision of the tool setting block 23 facilitates the tool setting operation during the machining process, enables the clamping, positioning and rotating device to closely cooperate with the processing equipment, ensures the smooth progress of the machining process, and improves the overall machining quality and efficiency.

[0045] Embodiment 2

[0046] This embodiment provides a method for using a clamping, positioning and rotating device for box-shaped workpieces, including the following steps:

[0047] S1. Fix the lower flat plate 21 on a machining center or a boring machine through the fasteners 11 at its four corners. The lower flat plate 21 is a square steel plate, and it is necessary to ensure its stability and accurate position during installation. A tool setting block 23 is provided on one side of the lower flat plate 21, which can be used for tool setting operation during the subsequent machining process.

[0048] S2. Place the box-shaped workpiece on the positioning seat of the upper flat plate 20, and use the first positioning pin 18 and the second positioning pin 19 on the positioning seat to perform preliminary positioning on the workpiece; connect the bottoms of the two long vertical rods 12 to the upper flat plate 20, and the connecting line of the connection points passes through the center of the hinge rod 14; adjust the first pressing plate 13 so that the pressing round block on the lower surface of the pressing plate presses the box-shaped workpiece tightly on the positioning seat; connect the bottoms of the two short vertical rods 17 to the upper flat plate 20, and the connecting line of the connection points forms a 45-degree angle with the connecting line of the bottoms of the two long vertical rods 12 and is set at a certain distance from the center of the hinge rod 14; adjust the second pressing plate 22 so that the pressing round block on the lower surface of the pressing plate prevents the box-shaped workpiece from rotating around the pressing round block on the first pressing plate 13 and the positioning seat. Thus, the clamping and fixing of the box-shaped workpiece are completed.

[0049] S3. When adjusting the machining angle of the workpiece, first loosen the T-shaped connecting piece 4 used to fix the upper flat plate 20 and the lower flat plate 21; the T-shaped connecting piece 4 is arranged in the inverted T-shaped annular groove of the lower flat plate 21 and is connected to the upper flat plate 20 through the through hole on the upper flat plate 20 and is fixed by the nut 6 and the washer 5 (flat washer 5 or spring washer 5). Loosening the nut 6 can release the fixation.

[0050] Push the upper flat plate 20 to rotate around the hinge rod 14 through the handle 16; the rolling steel balls 15 on the lower surface of the upper flat plate 20 cooperate with the annular rolling groove on the upper surface of the lower flat plate 21 to assist the upper flat plate 20 to rotate smoothly.

[0051] When rotating to the required angle, the positioning steel ball 2 will fall into the top of the positioning sleeve 1 at the corresponding position of the lower flat plate 21 under the action of the positioning spring 3, the steel ball ejector rod 9 and the fastener 11, realizing the control of the rotation angle between the upper flat plate 20 and the lower flat plate 21 and completing the angle positioning; multiple positioning sleeves 1 are uniformly arranged on the circle with the hinge rod 14 as the center, and the number thereof is determined according to the rotation accuracy of the positioning rotation device.

[0052] S4. After the angle adjustment is completed, tighten the T-shaped connecting piece 4 again to fix the upper flat plate 20 and the lower flat plate 21 to prevent the device from rotating during the machining process; according to the machining requirements, use a machining center or a boring machine to perform a tool setting operation in combination with the tool setting block 23 on one side of the lower flat plate 21, and then machine the clamped box-shaped workpiece.

[0053] S5. After the machining is completed, loosen the pressing plates of the first support frame and the second support frame to release the pressing state of the box-shaped workpiece, and remove the workpiece from the positioning seat to complete the entire usage process.

[0054] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A clamping, positioning and rotating device for box-shaped workpieces, characterized in that Including: An upper flat plate and a lower flat plate; the upper flat plate and the lower flat plate are rotatably connected relatively. The centers of the upper flat plate and the lower flat plate are hinged through a hinge rod. A plurality of vertical positioning sleeves are evenly arranged on the lower flat plate. A plurality of positioning holes corresponding to the positioning sleeves one by one are arranged on the upper flat plate. A positioning steel ball, a positioning spring, a steel ball ejector rod and a fastener are arranged in the positioning holes. The positioning steel ball contacts the top end of the positioning sleeve and is used to control the rotation angle between the upper flat plate and the lower flat plate. The positioning spring, the steel ball ejector rod and the fastener are used to press the positioning steel ball tightly; a U-shaped first support frame and a second support frame are arranged on the upper flat plate and are used to fix box-shaped workpieces.

2. The clamping and positioning rotary device for box-shaped workpieces according to claim 1, wherein A plurality of the positioning sleeves are evenly arranged on a circle with the hinge rod as the center. The number of the positioning sleeves is determined according to the rotation precision of the positioning rotation device.

3. A clamping, positioning and rotating device for box-shaped workpieces according to claim 1, characterized in that, The lower end of the positioning spring contacts the positioning steel ball. The upper end of the positioning spring contacts one end of the steel ball ejector rod. The other end of the steel ball ejector rod contacts the fastener, thereby pressing the positioning steel ball tightly.

4. A clamping, positioning and rotating device for box-shaped workpieces according to claim 1, characterized in that, An annular rolling groove with the hinge rod as the center is arranged on the upper surface of the lower flat plate. A plurality of rolling steel balls are arranged at the position corresponding to the rolling groove on the lower surface of the upper flat plate and are used to assist the rotation between the upper flat plate and the lower flat plate.

5. A clamping, positioning and rotating device for box-shaped workpieces according to claim 1, characterized in that An inverted T-shaped ring groove is arranged on the upper surface of the lower flat plate. A T-shaped connecting piece is arranged in the inverted T-shaped ring groove. The T-shaped connecting piece is connected with the upper flat plate through a through hole on the upper flat plate. The upper flat plate and the lower flat plate are fixed by tightening the T-shaped connecting piece; the T-shaped connecting piece is fixed with the upper flat plate through a nut. A washer is arranged between the nut and the upper flat plate. The washer is a flat washer or a spring washer.

6. A clamping, positioning and rotating device for box-shaped workpieces according to claim 1, characterized in that, A positioning seat is arranged at the center position of the upper flat plate. The positioning seat is fixed on the upper flat plate through the hinge rod. A first positioning pin and a second positioning pin are arranged on the positioning seat and are used to fix box-shaped workpieces.

7. The clamping, positioning and rotating device for box-shaped workpieces according to claim 6, characterized in that, The first support frame is composed of two long vertical rods and a first pressing plate. The bottom ends of the two long vertical rods are connected with the upper flat plate. The connection line of the two connection points passes through the center of the circle at the hinge rod position. The top ends of the two long vertical rods are connected with the first pressing plate. A pressing round block is arranged on the lower surface of the first pressing plate and is used to press the box-shaped workpiece tightly on the positioning seat.

8. A clamping, positioning and rotating device for box-shaped workpieces according to claim 7, characterized in that, The second support frame is composed of two short vertical rods and a second pressing plate. The bottom ends of the two short vertical rods are connected with the upper flat plate. The included angle between the connection line of the two connection points and the connection line of the bottom ends of the two long vertical rods is 45 degrees and is at a set distance from the center of the circle at the hinge rod position; the top ends of the two short vertical rods are connected with the second pressing plate. A pressing round block is also arranged on the lower surface of the second pressing plate and is used to prevent the box-shaped workpiece from rotating around the pressing round block on the first pressing plate and the positioning seat.

9. A clamping, positioning and rotating device for box-shaped workpieces according to claim 7, characterized in that, The upper flat plate is made of circular steel plate. A handle is provided on the upper flat plate for rotating the positioning and rotating device. The lower flat plate is made of square steel plate. Four corners of the lower flat plate are fixedly installed on a machining center or a boring machine through fasteners. A tool setting block is provided on one side of the lower flat plate.

10. The usage method of a clamping, positioning and rotating device for box-shaped workpieces according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Fix the lower flat plate on a machining center or a boring machine through the fasteners at its four corners. The lower flat plate is a square steel plate, and it is necessary to ensure its stability and accurate position during installation. A tool setting block is provided on one side of the lower flat plate, which can be used for tool setting operation during subsequent processing. S2. Place the box-shaped workpiece on the positioning seat of the upper flat plate, and preliminarily position the workpiece by using the first positioning pin and the second positioning pin on the positioning seat. Connect the bottom ends of the two long vertical rods to the upper flat plate, and the connecting line of the connection points passes through the center of the hinge rod. Adjust the first pressing plate so that the pressing round block on the lower surface of the pressing plate presses the box-shaped workpiece against the positioning seat. Connect the bottom ends of the two short vertical rods to the upper flat plate. Adjust the second pressing plate so that the pressing round block on the lower surface of the pressing plate prevents the box-shaped workpiece from rotating around the pressing round block on the first pressing plate and the positioning seat. S3. When adjusting the machining angle of the workpiece, first loosen the T-shaped connecting piece; loosening the nut can release the fixation. Push the upper flat plate to rotate around the hinge rod through the handle. When rotating to the required angle, the positioning steel ball will fall into the top end of the positioning sleeve at the corresponding position of the lower flat plate under the action of the positioning spring, the steel ball ejector rod and the fastener, so as to control the rotation angle between the upper flat plate and the lower flat plate and complete the angle positioning. S4. After the angle adjustment is completed, tighten the T-shaped connecting piece again to fix the upper flat plate and the lower flat plate to prevent the device from rotating during processing. According to the processing requirements, use the machining center or the boring machine, and combine with the tool setting block on one side of the lower flat plate to perform tool setting operation, and then process the clamped box-shaped workpiece. S5. After the processing is completed, loosen the pressing plates of the first support frame and the second support frame to release the pressing state of the box-shaped workpiece, and remove the workpiece from the positioning seat to complete the entire usage process.

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