Flat-plate-shaped thin-wall workpiece positioning tool

Abstract

The utility model discloses a flat-plate-shaped thin-wall workpiece positioning tool which comprises a bottom plate, and a positioning column, a side positioning mechanism, a negative pressure supporting piece and an auxiliary pressing device are arranged on the bottom plate. A positioning surface and a bolt are arranged at the upper end of the positioning column, and the bolt is matched with a screw hole in the flat-plate-shaped thin-wall workpiece; the negative pressure supporting piece comprises a shell and a liftable movable rod, an oil pressure driving mechanism used for driving the movable rod to ascend and descend and a locking mechanism used for locking the movable rod are arranged in the shell, an ejector rod and a suction cup are arranged at the upper end of the movable rod, and the ejector rod is located in the suction cup; the negative pressure supporting piece supports the lower end of the flat-plate-shaped thin-wall workpiece. When the clamping device is used for clamping the flat-plate-shaped thin-wall workpiece, upward floating of the flat-plate-shaped thin-wall workpiece can be effectively avoided through downward pulling force of the suction cup on the flat-plate-shaped thin-wall workpiece, so that bending of the flat-plate-shaped thin-wall workpiece is effectively avoided, and vibration generated in the machining process of the flat-plate-shaped thin-wall workpiece is effectively restrained.

Description

Technical Field

[0001] The utility model relates to the technical field of tooling fixtures, and particularly relates to a positioning tooling for flat thin-walled workpieces. Background Art

[0002] As Figure 11 shown, an existing flat thin-walled workpiece 11 is in a flat shape as a whole and has a relatively thin thickness. A screw hole 10-2 is provided on the flat thin-walled workpiece 11. A machining surface 10-1 needs to be formed on one side of the flat thin-walled workpiece by milling. When milling, it is necessary to first clamp and fix the flat thin-walled workpiece 11 through a special tooling fixture. When clamping, the machining surface on the flat thin-walled workpiece 11 faces upward, and the milling cutter feeds on the upper surface of the flat thin-walled workpiece 11 and performs milling.

[0003] However, since the overall thickness of the flat thin-walled workpiece 11 is relatively thin (the thinnest part is usually no more than 5 mm), the rigidity is poor, and it will be bent or vibrated up and down by the acting force of the tool during the machining process, thus seriously affecting the machining accuracy. Summary of the Invention

[0004] The purpose of the utility model is to solve the deficiencies in the prior art and provide a positioning tooling for flat thin-walled workpieces.

[0005] The purpose of the utility model is realized through the following technical scheme: a positioning tooling for flat thin-walled workpieces, including a bottom plate, on which a positioning column, a side positioning mechanism, a negative pressure support member, and an auxiliary pressing device are provided;

[0006] The upper end of the positioning column is provided with a positioning surface and a plug pin, and the plug pin is matched with the screw hole on the flat thin-walled workpiece; the side positioning mechanism is used for horizontally positioning the flat thin-walled workpiece;

[0007] The negative pressure support member includes a housing, a liftable movable rod, an oil pressure driving mechanism for driving the lifting of the movable rod and a locking mechanism for locking the movable rod are arranged in the housing, the upper end of the movable rod is provided with a top rod and a suction cup, and the top rod is located in the suction cup; the negative pressure support member supports the lower end of the flat thin-walled workpiece; during support, the upper end of the top rod contacts the lower end of the flat thin-walled workpiece, and negative pressure is generated in the suction cup to generate a downward pulling force on the flat thin-walled workpiece.

[0008] Preferably, the side positioning mechanism includes a first side positioning seat and a second side positioning seat, which are arranged opposite to each other; a side top cylinder is arranged on the first side positioning seat, and a side positioning pin is arranged on the second side positioning seat; when the side positioning mechanism horizontally positions the flat thin-walled workpiece, the side top cylinder presses against one side of the flat thin-walled workpiece, and the side positioning pin on the second side positioning seat presses against the other side of the flat thin-walled workpiece.

[0009] Preferably, two side jacking cylinders are provided on one side of the first side positioning seat corresponding to the second side positioning seat, and two side positioning pins are provided on the second positioning seat.

[0010] Preferably, the side jacking cylinder includes a first cylinder body. A first piston cavity is provided in the first cylinder body. A first piston is provided in the first piston cavity. A telescopic rod is provided on the first piston and passes through the first cylinder body. A first spring is provided between the first piston and one end of the first piston cavity. An air inlet hole is provided at the other end of the first piston cavity. A gas distribution channel is provided in the first side positioning seat, and the air inlet hole is connected to the gas distribution channel.

[0011] Preferably, an inner cavity is provided in the outer shell. A guiding hole is provided at the upper end of the outer shell, and the movable rod passes through the guiding hole. The hydraulic driving mechanism includes a second cylinder body provided at the lower end of the outer shell. A second piston cavity is provided in the second cylinder body. A second piston is provided in the second piston cavity. A second spring is provided between the second piston and the upper end of the second piston cavity. An extension rod is connected to the second piston. A central channel is provided in the movable rod, and the extension rod extends into the central channel. A third spring is provided between the lower end of the ejector rod and the upper end of the extension rod.

[0012] The locking mechanism includes a clamping sleeve provided on the outer side of the movable rod and a pressing sleeve provided on the outer side of the clamping sleeve. A contraction gap is provided on the clamping sleeve. An outer conical surface is provided on the outer side of the clamping sleeve. An inner conical surface is provided on the inner side of the pressing sleeve. Ball bearings are provided between the outer conical surface and the inner conical surface. An oil pressure cavity is formed between the upper end of the pressing sleeve and the upper end of the inner cavity. An oil passing annular gap is formed between the outer side of the pressing sleeve and the side wall of the inner cavity. The oil passing annular gap is communicated with the oil pressure cavity. A connecting channel is provided on the second cylinder body, and the connecting channel communicates the oil passing annular gap with the second piston cavity. A fourth spring is provided between the pressing sleeve and the second cylinder body. A fourth sealing ring is provided between the inner side of the pressing sleeve and the outer shell. A third sealing ring is provided between the inner side of the pressing sleeve and the outer side of the second cylinder body. When the pressing sleeve moves downward, the clamping sleeve contracts and clamps the movable rod.

[0013] A third air extraction channel is provided in the ejector rod, and an air suction cavity is provided in the suction cup. The second air extraction channel communicates the air suction cavity with the central channel in the movable rod. A second air extraction channel is provided on the second cylinder body, and the third air extraction channel is communicated with the central channel.

[0014] Preferably, a fixing seat is provided on the bottom plate, and the negative pressure support member is arranged on the fixing seat; a hydraulic oil transition channel corresponding to the second piston chamber and an air extraction transition channel corresponding to the second air extraction channel are provided on the fixing seat, a first hydraulic oil channel corresponding to the hydraulic oil transition channel and a first air extraction channel corresponding to the air extraction transition channel are provided on the bottom plate, the hydraulic oil transition channel connects the first hydraulic oil channel and the second piston chamber, and the air extraction transition channel connects the first air extraction channel and the second air extraction channel; one end of the first air extraction channel and one end of the first hydraulic oil channel penetrate through the side surface of the bottom plate; the first air extraction channel is connected to an air extraction device, and the first hydraulic oil channel is connected to a hydraulic oil station.

[0015] Preferably, a fifth sealing ring is provided at the lower end of the hydraulic oil transition channel, and a sixth sealing ring is provided at the lower end of the air extraction transition channel. Both the fifth sealing ring and the sixth sealing ring are in contact with the bottom plate.

[0016] Preferably, the auxiliary pressing device includes a pressing cylinder, a pressing arm, and a connecting rod. A connecting seat is provided on the pressing cylinder. One end of the pressing arm is rotatably connected to the piston rod on the pressing cylinder. One end of the connecting rod is rotatably connected to the connecting seat, and the other end of the connecting rod is rotatably connected to the pressing arm.

[0017] The beneficial effects of the present utility model are as follows: When clamping a flat thin-walled workpiece, the downward pulling force of the suction cup on the flat thin-walled workpiece can effectively prevent the flat thin-walled workpiece from floating upward. By jointly using multiple negative pressure support members, the multiple negative pressure support members act on multiple different position points on the flat thin-walled workpiece respectively, so as to effectively fix and support multiple position points on the flat thin-walled workpiece, prevent these position points from floating upward, effectively avoid the bending of the flat thin-walled workpiece, and also effectively suppress the vibration generated by the flat thin-walled workpiece during the processing process. Description of the Drawings

[0018] Figure 1 is a structural schematic diagram of the present utility model.

[0019] Figure 2 is a structural schematic diagram of the positioning column.

[0020] Figure 3 is a structural schematic diagram of the second side positioning seat.

[0021] Figure 4 is a structural schematic diagram of the first side positioning seat.

[0022] Figure 5 is a structural schematic diagram of the auxiliary pressing device.

[0023] Figure 6 is a cross-sectional view of the negative pressure support member.

[0024] Figure 7 is Figure 6 the enlarged view of part A in

[0025] Figure 8 the structural schematic diagram when the negative pressure support member is installed on the fixed seat.

[0026] Figure 9 the structural schematic diagram of the clamping sleeve.

[0027] Figure 10 the schematic diagram when positioning the flat thin-walled workpiece through the present utility model.

[0028] Figure 11 the structural schematic diagram of an existing flat thin-walled workpiece.

[0029] In the figure: 1. bottom plate, 1-1. first hydraulic oil channel, 1-2. first air extraction channel, 2. first side positioning seat, 2-1. gas distribution channel, 3. side top cylinder, 3-1. first cylinder block, 3-2. first piston, 3-3. first piston chamber, 3-4. first spring, 3-5. telescopic rod, 4. second side positioning seat, 4-1. side positioning pin, 5. positioning column, 5-1. positioning surface, 5-2. plug pin, 6. negative pressure support member, 6-1. outer shell, 6-2. second cylinder block, 6-3. second piston, 6-4. extension rod, 6-5. movable rod, 6-6. ejector rod, 6-7. suction cup, 6-8. third air extraction channel, 6-9. compression sleeve, 6-10. clamping sleeve, 6-11. second spring, 6-12. third spring, 6-13. second piston chamber, 6-14. connection channel, 6-15. oil passing annular gap, 6-16. oil pressure chamber, 6-17. second air extraction channel, 6-18. central channel, 6-19. steel ball, 6-21. first sealing ring, 6-22. second sealing ring, 6-23. third sealing ring, 6-24. fourth sealing ring, 6-26. inner clamping surface, 6-27. outer conical surface, 6-28. contraction gap, 6-29. inner conical surface, 6-30. fourth spring, 7. fixed seat, 7-1. hydraulic oil transition channel, 7-2. air extraction transition channel, 7-3. fifth sealing ring, 7-4. sixth sealing ring, 8. auxiliary compression device, 8-1. compression cylinder, 8-2. connection seat, 8-3. compression arm, 8-4. connecting rod, 10. flat thin-walled workpiece, 10-1. processing surface, 10-2. screw hole. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art shall fall within the protection scope of the present utility model.

[0031] Those skilled in the art should understand that in the disclosure of the present utility model, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present utility model.

[0032] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "one" should not be construed as a limitation on the quantity.

[0033] As Figures 1 to 11 shown, a positioning tooling for a flat thin-walled workpiece includes a bottom plate 1, on which a positioning post 5, a side positioning mechanism, a negative pressure support member 6, and an auxiliary pressing device 8 are provided;

[0034] The upper end of the positioning post 5 is provided with a positioning surface 5-1 and a plug pin 5-2, and the plug pin 5-2 is matched with a screw hole 10-2 on the flat thin-walled workpiece 10; the side positioning mechanism is used for horizontally positioning the flat thin-walled workpiece 10;

[0035] The negative pressure support member 6 includes a housing 6-1 and a liftable movable rod 6-5. An oil pressure driving mechanism for driving the lifting of the movable rod 6-5 and a locking mechanism for locking the movable rod 6-5 are provided in the housing 6-1. The upper end of the movable rod 6-5 is provided with a top rod 6-6 and a suction cup 6-7, and the top rod 6-6 is located in the suction cup 6-7; the negative pressure support member 6 supports the lower end of the flat thin-walled workpiece 10; during support, the upper end of the top rod 6-6 contacts the lower end of the flat thin-walled workpiece 10, and negative pressure is generated in the suction cup 6-7 to generate a downward pulling force on the flat thin-walled workpiece 10;

[0036] Before the negative pressure support member 6 supports the flat thin-walled workpiece 10, the auxiliary pressing device 8 contacts the upper end of the flat thin-walled workpiece 10 and applies a downward pressure to the upper end of the flat thin-walled workpiece 10 so that the lower end of the flat thin-walled workpiece 10 contacts the positioning surface 5-1 on the positioning post 5; when the flat thin-walled workpiece 10 is being processed, the auxiliary pressing device 8 is separated from the flat thin-walled workpiece 10.

[0037] The positioning post 5, the side positioning mechanism, the negative pressure support member 6, and the auxiliary pressing device 8 together constitute a positioning unit for positioning and clamping the flat thin-walled workpiece 10. A positioning unit includes several negative pressure support members 6. In the present utility model, the positioning unit includes three negative pressure support members 6, and the bottom of the flat thin-walled workpiece 10 is supported by the three negative pressure support members 6 together.

[0038] When the present utility model clamps the flat thin-walled workpiece 10, the side positioning mechanism is used to position the flat thin-walled workpiece 10 in the horizontal direction. When the negative pressure support member 6 supports the bottom of the flat thin-walled workpiece 10, the movable rod 6-5 first rises upward and drives the ejector rod 6-6 and the suction cup 6-7 to rise. After the ejector rod 6-6 contacts the lower end of the flat thin-walled workpiece 10, the movable rod 6-5 is locked by the locking mechanism to make it immovable, so that the ejector rod 6-6 is stably maintained at the current height position; after the ejector rod 6-6 contacts the lower end of the flat thin-walled workpiece 10, the suction cup 6-7 is evacuated to generate negative pressure in the suction cup 6-7, and the suction cup 6-7 sucks the lower end of the flat thin-walled tooling. The negative pressure of the suction cup 6-7 generates a downward pulling force on the flat thin-walled workpiece 10, so that the lower end of the flat thin-walled workpiece 10 can be firmly pressed against the upper end of the ejector rod 6-6. The advantages are as follows: through the downward pulling force of the suction cup 6-7 on the flat thin-walled workpiece 10, the upward floating of the flat thin-walled workpiece 10 can be effectively avoided. By the combined use of multiple negative pressure support members 6, the multiple negative pressure support members 6 act on multiple different position points on the flat thin-walled workpiece 10 respectively, so as to effectively fix and support multiple position points on the flat thin-walled workpiece 10, avoid the upward floating of these position points, thus effectively avoiding the bending of the flat thin-walled workpiece 10, and also effectively suppressing the vibration generated by the flat thin-walled workpiece 10 during the processing.

[0039] Before the negative pressure support member 6 supports the flat thin-walled workpiece 10, the flat thin-walled workpiece 10 is pressed downward by the auxiliary pressing device 8 so that the flat thin-walled workpiece 10 can be firmly pressed. When the flat thin-walled workpiece 10 is pressed, the lower end of the flat thin-walled workpiece 10 is in close contact with the positioning surface 5-1 on the positioning post 5, preventing the flat thin-walled workpiece 10 from moving upward when the ejector rod 6-6 on the negative pressure support member 6 jacks upward, which may change the clamping position of the flat thin-walled workpiece 10. Among them, the auxiliary pressing device 8 plays a role of temporarily pressing the flat thin-walled workpiece 10. After the negative pressure support member 6 completes the bottom support of the flat thin-walled workpiece 10, the auxiliary pressing device 8 disengages from the flat thin-walled workpiece 10 and moves away above the flat thin-walled workpiece 10. The purpose of this is that when machining the machining surface 10-1 on the flat thin-walled workpiece 10, the cutting tool needs to feed at the upper end of the flat thin-walled workpiece 10, and the auxiliary pressing device 8 moves away above the flat thin-walled workpiece 10 after the pressing task is completed, which can avoid interfering with the feed of the cutting tool.

[0040] Among them, the side positioning mechanism includes a first side positioning seat 2 and a second side positioning seat 4, and the first side positioning seat 2 and the second side positioning seat 4 are arranged opposite to each other; a side jacking cylinder 3 is provided on the first side positioning seat 2, and a side positioning pin 4-1 is provided on the second side positioning seat 4; when the side positioning mechanism horizontally positions the flat thin-walled workpiece 10, the side jacking cylinder 3 jacks up one side of the flat thin-walled workpiece 10, and the side positioning pin 4-1 on the second side positioning seat 4 jacks up the other side of the flat thin-walled workpiece 10. Among them, two side jacking cylinders 3 are provided on the side of the first side positioning seat 2 corresponding to the second side positioning seat 4, and two side positioning pins 4-1 are provided on the second positioning seat.

[0041] Specifically, the side jacking cylinder 3 includes a first cylinder body 3-1, a first piston cavity 3-3 is provided in the first cylinder body 3-1, a first piston 3-2 is provided in the first piston cavity 3-3, a telescopic rod 3-5 is provided on the first piston 3-2, and the telescopic rod 3-5 passes through the first cylinder body 3-1; a first spring 3-4 is provided between the first piston 3-2 and one end of the first piston cavity 3-3, and an air inlet hole is provided at the other end of the first piston cavity 3-3; a gas distribution channel 2-1 is provided in the first side positioning seat 2, and the air inlet hole is connected to the gas distribution channel 2-1.

[0042] When the side positioning mechanism horizontally positions the flat thin-walled workpiece 10, compressed gas is introduced into the first piston chamber 3-3 of each side jacking cylinder 3 through the gas distribution channel 2-1. The compressed gas pushes the first piston 3-2 to move, causing the telescopic rod 3-5 to extend outwards. Thus, the telescopic rod 3-5 presses against one side of the flat thin-walled workpiece 10. Under the pressing force of the telescopic rod 3-5, the other side of the flat thin-walled workpiece 10 presses against the side positioning pin 4-1, thereby realizing the positioning of the flat thin-walled workpiece 10 in the horizontal direction.

[0043] A guiding hole is provided at the upper end of the housing 6-1, and the movable rod 6-5 passes through the guiding hole; the oil pressure driving mechanism includes a second cylinder block 6-2, and the second cylinder block 6-2 is arranged at the lower end of the housing 6-1; a second piston chamber 6-13 is provided in the second cylinder block 6-2, a second piston 6-3 is arranged in the second piston chamber 6-13, and a second spring 6-11 is arranged between the second piston 6-3 and the upper end of the second piston chamber 6-13; an extension rod 6-4 is connected to the second piston 6-3; a central channel 6-18 is provided in the movable rod 6-5, and the extension rod 6-4 extends into the central channel 6-18; a third spring 6-12 is arranged between the lower end of the ejector rod 6-6 and the upper end of the extension rod 6-4;

[0044] The locking mechanism includes a clamping sleeve 6-10 arranged on the outside of the movable rod 6-5 and a pressing sleeve 6-9 arranged on the outside of the clamping sleeve 6-10. A contraction gap 6-28 is provided on the clamping sleeve 6-10. An outer conical surface 6-27 is provided on the outside of the clamping sleeve 6-10, an inner clamping surface 6-26 is provided on the inside of the clamping sleeve, an inner conical surface 6-29 is provided on the inside of the pressing sleeve 6-9, and ball bearings are arranged between the outer conical surface 6-27 and the inner conical surface 6-29; an oil pressure chamber 6-16 is formed between the upper end of the pressing sleeve 6-9 and the upper end of the inner cavity, and an oil passing annular gap 6-15 is formed between the outside of the pressing sleeve 6-9 and the side wall of the inner cavity; the oil passing annular gap 6-15 is communicated with the oil pressure chamber 6-16, and a connecting channel 6-14 is provided on the second cylinder block 6-2, and the connecting channel 6-14 communicates the oil passing annular gap 6-15 with the second piston chamber 6-13; a fourth spring 6-30 is arranged between the pressing sleeve 6-9 and the second cylinder block 6-2; a fourth sealing ring 6-24 is arranged between the inside of the pressing sleeve 6-9 and the housing 6-1, and a third sealing ring 6-23 is arranged between the inside of the pressing sleeve 6-9 and the outside of the second cylinder block 6-2; when the pressing sleeve 6-9 moves downwards, the clamping sleeve 6-10 contracts and clamps the movable rod 6-5;

[0045] A third air extraction channel 6-8 is provided in the ejector rod 6-6, an air suction chamber is provided in the suction cup 6-7, and a second air extraction channel 6-17 communicates the air suction chamber with the central channel 6-18 in the movable rod 6-5; a second air extraction channel 6-17 is provided on the second cylinder block 6-2, and the third air extraction channel 6-8 is communicated with the central channel 6-18.

[0046] Among them, the taper of the outer conical surface 6-27 is the same as that of the inner conical surface 6-29. The diameter of the lower end of the outer conical surface 6-27 is larger than that of the upper end, and the diameter of the lower end of the inner conical surface 6-29 is larger than that of the upper end. When the pressing sleeve 6-9 moves downward, the pressing sleeve 6-9 drives the ball to move radially inward of the pressing sleeve 6-9, thereby generating an inward squeezing force on the outer side of the clamping sleeve 6-10, forcing the clamping sleeve 6-10 to contract and firmly clamp the movable rod 6-5.

[0047] When the negative pressure support member 6 supports the bottom of the flat thin-walled workpiece 10, hydraulic oil is introduced into the second piston chamber 6-13. The hydraulic oil pushes the second piston 6-3 to move upward. When the second piston 6-3 moves upward, it drives the movable rod 6-5 and the ejector rod 6-6 to move upward until the ejector rod 6-6 contacts the lower end of the flat thin-walled workpiece 10. At this time, the upper end of the suction cup 6-7 contacts the lower end of the flat thin-walled workpiece 10; a part of the hydraulic oil entering the second piston chamber 6-13 enters the oil pressure chamber 6-16 through the connection channel 6-14 and the oil passing annular gap 6-15, pushing the pressing sleeve 6-9 to move downward, causing the clamping sleeve 6-10 to contract and clamp the movable rod 6-5; then the air extraction device is turned on and the suction cup 6-7 is evacuated to generate negative pressure inside the suction cup 6-7. The suction cup 6-7 sucks the lower end of the flat thin-walled workpiece 10 and generates a downward pulling force on the flat thin-walled workpiece 10. When the support task of the negative pressure support member 6 for the flat thin-walled workpiece 10 is completed and the flat thin-walled workpiece 10 needs to be released, the suction cup 6-7 is inflated to make the pressure inside the suction cup 6-7 consistent with the external air pressure, the hydraulic oil is depressurized, and the pressing sleeve 6-9 moves upward under the action of the fourth spring 6-30, so that the clamping sleeve 6-10 releases the movable rod 6-5, and then the second piston 6-3 moves downward and resets under the action of the second spring 6-11.

[0048] Furthermore, a fixed seat 7 is provided on the bottom plate 1, and the negative pressure support member 6 is arranged on the fixed seat 7; a hydraulic oil transition channel 7-1 corresponding to the second piston chamber 6-13 and an air extraction transition channel 7-2 corresponding to the second air extraction channel 6-17 are provided on the fixed seat 7. A first hydraulic oil channel 1-1 corresponding to the hydraulic oil transition channel 7-1 and a first air extraction channel 1-2 corresponding to the air extraction transition channel 7-2 are provided on the bottom plate 1. The hydraulic oil transition channel 7-1 connects the first hydraulic oil channel 1-1 and the second piston chamber 6-13, and the air extraction transition channel 7-2 connects the first air extraction channel 1-2 and the second air extraction channel 6-17; one end of the first air extraction channel 1-2 and one end of the first hydraulic oil channel 1-1 both penetrate the side surface of the bottom plate 1; the first air extraction channel 1-2 is connected to the air extraction device, and the first hydraulic oil channel 1-1 is connected to the hydraulic oil station. The fixed seat 7 is fixed to the bottom plate 1 by bolts.

[0049] When hydraulic oil is introduced into the second piston chamber 6-13, the hydraulic oil sequentially passes through the first hydraulic oil passage 1-1 and the hydraulic oil transition passage 7-1 and enters the second piston chamber 6-13. When air is evacuated from the suction cups 6-7, the air in the suction cups 6-7 sequentially passes through the third air extraction passage 6-8, the central passage 6-18, the second air extraction passage 6-17, the air extraction transition passage 7-2, and the first air extraction passage 1-2 and is extracted outwards.

[0050] In the present utility model, both the supply passage and the air extraction passage of the hydraulic oil are hidden inside the bottom plate 1, and no external connecting pipelines are required; this setting method greatly reduces the number of pipelines outside the positioning tooling for the flat thin-walled workpiece 10 and avoids the external mess of the positioning tooling for the flat thin-walled workpiece 10 due to excessive external pipelines.

[0051] A fifth sealing ring 7-3 is provided at the lower end of the hydraulic oil transition passage 7-1, and a sixth sealing ring 7-4 is provided at the lower end of the air extraction transition passage 7-2. Both the fifth sealing ring 7-3 and the sixth sealing ring 7-4 are in contact with the bottom plate 1. A first sealing ring 6-21 is provided at the lower end of the second piston chamber 6-13, and a second sealing ring 6-22 is provided at the edge of the lower end of the second cylinder block 6-2. Both the first sealing ring 6-21 and the second sealing ring 6-22 are in sealing contact with the fixed seat 7.

[0052] The auxiliary pressing device 8 includes a pressing cylinder 8-1, a pressing arm 8-3, and a connecting rod 8-4. A connecting seat 8-2 is provided on the pressing cylinder 8-1. One end of the pressing arm 8-3 is rotatably connected to the piston rod on the pressing cylinder 8-1. One end of the connecting rod 8-4 is rotatably connected to the connecting seat 8-2, and the other end of the connecting rod 8-4 is rotatably connected to the pressing arm 8-3. Among them, the end of the pressing arm 8-3 away from the pressing cylinder 8-1 is the pressing end, and the pressing end is used to directly contact the upper end of the flat thin-walled workpiece 10 and press the upper end of the flat thin-walled workpiece 10.

[0053] The pressing cylinder 8-1 is vertically arranged. When the piston rod on the pressing cylinder 8-1 moves upwards, it drives the pressing end of the pressing arm 8-3 to rotate downwards, thereby pressing the flat thin-walled workpiece 10 downwards. When the piston rod on the pressing cylinder 8-1 moves downwards, it drives the pressing end of the pressing arm 8-3 to rotate upwards and away from the flat thin-walled workpiece 10, thereby releasing the flat thin-walled workpiece 10.

[0054] A method for using a positioning tooling for a flat thin-walled workpiece 10 includes the following specific steps:

[0055] Step 1: Place the flat thin-walled workpiece 10 on the positioning posts 5 and insert the jacks on the positioning posts 5 into the screw holes 10-2 on the flat thin-walled workpiece 10.

[0056] Step 2: The telescopic rod 3-5 on the side jacking cylinder on the first side positioning seat 2 extends outwards and presses tightly against one side of the flat thin-walled workpiece 10, and the other side of the flat thin-walled workpiece 10 is pressed tightly against the side positioning pin 4-1 on the second side positioning seat 4.

[0057] Step 3: The auxiliary pressing device 8 applies a downward pressure to the upper end of the flat thin-walled workpiece 10 so that the lower end of the flat thin-walled workpiece 10 contacts the positioning surface 5-1 on the positioning column 5.

[0058] Step 4: Hydraulic oil is introduced into the second piston chamber 6-13 through the first hydraulic oil channel 1-1 and the hydraulic oil transition channel 7-1. The hydraulic oil pushes the second piston 6-3 to move upwards. When the second piston 6-3 moves upwards, it drives the movable rod 6-5 and the ejector rod 6-6 to move upwards until the ejector rod 6-6 contacts the lower end of the flat thin-walled workpiece 10. At this time, the upper end of the suction cup 6-7 contacts the lower end of the flat thin-walled workpiece 10; a part of the hydraulic oil entering the second piston chamber 6-13 enters the oil pressure chamber 6-16 through the connecting channel 6-14 and the oil passing annular gap 6-15, pushing the pressing sleeve 6-9 to move downwards, causing the clamping sleeve 6-10 to contract and clamp the movable rod 6-5; then the air extraction device is turned on and the suction cup 6-7 is evacuated to generate negative pressure in the suction cup 6-7. The suction cup 6-7 sucks the lower end of the flat thin-walled workpiece 10 and generates a downward pulling force on the flat thin-walled workpiece 10.

[0059] Among them, when evacuating the suction cup 6-7, the air in the suction cup 6-7 is sequentially extracted outwards through the third air extraction channel 6-8, the central channel 6-18, the second air extraction channel 6-17, the air extraction transition channel 7-2, and the first air extraction channel 1-2.

[0060] Step 4: The auxiliary pressing device 8 is separated from the flat thin-walled workpiece 10.

[0061] The present utility model is not limited to the above best embodiment. Anyone can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as it has a technical solution identical or similar to the present application, it falls within the protection scope of the present utility model.

Claims

1. A flat thin-wall workpiece positioning tool, characterized in that: It includes a bottom plate, on which are provided positioning columns, a side positioning mechanism, a negative pressure support member, and an auxiliary pressing device; The upper end of the positioning column is provided with a positioning surface and a latch, and the latch matches with a screw hole on a flat thin-walled workpiece; the side positioning mechanism is used to horizontally position the flat thin-walled workpiece; The negative pressure support member includes an outer shell and a movable rod that can be raised and lowered. The outer shell is provided with an oil pressure drive mechanism for driving the movable rod to rise and fall and a locking mechanism for locking the movable rod. The upper end of the movable rod is provided with a push rod and a suction cup, and the push rod is located in the suction cup. The negative pressure support member supports the lower end of the flat thin-walled workpiece. When supporting, the upper end of the push rod contacts the lower end of the flat thin-walled workpiece, negative pressure is generated in the suction cup, and a downward pulling force is generated on the flat thin-walled workpiece.

2. The flat thin-wall workpiece positioning fixture according to claim 1 is characterized in that: The side positioning mechanism includes a first side positioning seat and a second side positioning seat, and the first side positioning seat and the second side positioning seat are arranged opposite to each other; a side push cylinder is provided on the first side positioning seat, and a side positioning pin is provided on the second side positioning seat; when the side positioning mechanism performs horizontal positioning on a flat-plate thin-walled workpiece, the side push cylinder presses one side of the flat-plate thin-walled workpiece, and the side positioning pin on the second side positioning seat presses the other side of the flat-plate thin-walled workpiece.

3. The flat thin-wall workpiece positioning tool according to claim 2 is characterized in that: Two side push cylinders are arranged on one side of the first side positioning seat corresponding to the second side positioning seat, and two side positioning pins are arranged on the second positioning seat.

4. The flat thin-wall workpiece positioning tool according to claim 3 is characterized in that: The side top cylinder includes a first cylinder body, a first piston chamber is provided in the first cylinder body, a first piston is provided in the first piston chamber, a telescopic rod is provided on the first piston, and the telescopic rod passes through the first cylinder body; a first spring is provided between the first piston and one end of the first piston chamber, and an air inlet hole is provided at the other end of the first piston chamber; a gas distribution channel is provided in the first side positioning seat, and the air inlet hole is connected to the gas distribution channel.

5. The flat thin-wall workpiece positioning tool according to claim 1, characterized in that: An inner cavity is provided in the outer shell, a guide hole is provided at the upper end of the outer shell, and the movable rod passes through the guide hole; the oil pressure drive mechanism includes a second cylinder body, and the second cylinder body is arranged at the lower end of the outer shell; a second piston cavity is provided in the second cylinder body, a second piston is provided in the second piston cavity, and a second spring is provided between the second piston and the upper end of the second piston cavity; an extension rod is connected to the second piston; a central channel is provided in the movable rod, and the extension rod extends into the central channel; a third spring is provided between the lower end of the push rod and the upper end of the extension rod; The locking mechanism comprises a clamping sleeve arranged on the outside of the movable rod and a pressing sleeve arranged on the outside of the clamping sleeve, a shrinkage gap is arranged on the clamping sleeve, an outer conical surface is arranged on the outer side of the clamping sleeve, an inner conical surface is arranged on the inner side of the pressing sleeve, and a ball is arranged between the outer conical surface and the inner conical surface; an oil pressure cavity is formed between the upper end of the pressing sleeve and the upper end of the inner cavity, and an oil annular gap is formed between the outer side of the pressing sleeve and the side wall of the inner cavity; the oil annular gap is connected with the oil pressure cavity, and a connecting channel is arranged on the second cylinder body, and the connecting channel connects the oil annular gap with the second piston cavity; a fourth spring is arranged between the clamping sleeve and the second cylinder body; a fourth sealing ring is arranged between the inner side of the clamping sleeve and the outer side of the outer shell, and a third sealing ring is arranged between the inner side of the clamping sleeve and the outer side of the second cylinder body; when the pressing sleeve moves downward, the clamping sleeve contracts and clamps the movable rod; A third air extraction channel is arranged in the push rod, an air suction cavity is arranged in the suction cup, and the second air extraction channel connects the air suction cavity with the central channel in the movable rod; a second air extraction channel is arranged on the second cylinder body, and the third air extraction channel is connected with the central channel.

6. The flat thin-wall workpiece positioning tool according to claim 5, characterized in that: A fixing seat is provided on the base plate, and a negative pressure support is arranged on the fixing seat; a hydraulic oil transition channel corresponding to the second piston chamber and an air extraction transition channel corresponding to the second air extraction channel are provided on the fixing seat, and a first hydraulic oil channel corresponding to the hydraulic oil transition channel and a first air extraction channel corresponding to the air extraction transition channel are provided on the base plate, the hydraulic oil transition channel connects the first hydraulic oil channel and the second piston chamber, and the air extraction transition channel connects the first air extraction channel and the second air extraction channel; one end of the first air extraction channel and one end of the first hydraulic oil channel both pass through the side of the base plate; the first air extraction channel is connected to the air extraction device, and the first hydraulic oil channel is connected to the hydraulic oil station.

7. The flat thin-wall workpiece positioning tool according to claim 6, characterized in that: A fifth sealing ring is disposed at the lower end of the hydraulic oil transition channel, and a sixth sealing ring is disposed at the lower end of the air extraction transition channel. Both the fifth sealing ring and the sixth sealing ring are in contact with the bottom plate.

8. The flat thin-wall workpiece positioning tool according to any one of claims 1 to 7, characterized in that: The auxiliary clamping device includes a clamping cylinder, a clamping arm, and a connecting rod. The clamping cylinder is provided with a connecting seat. One end of the clamping arm is rotatably connected to the piston rod on the clamping cylinder, one end of the connecting rod is rotatably connected to the connecting seat, and the other end of the connecting rod is rotatably connected to the clamping arm.

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