Height-adjustable clamping device
By designing a height-adjustable clamping device, the clamping and machining problems of the nozzle groove in the high-pressure steam chamber were solved, achieving stable clamping and efficient machining, meeting high-precision machining requirements, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-03-03
AI Technical Summary
Existing technologies are difficult to effectively clamp and process high-pressure steam chamber nozzle slots, resulting in problems such as cracks in the welded joints, unreliable clamps, severe vibration during processing, and difficulty in controlling dimensional and positional tolerances.
A height-adjustable clamping device was designed, including an inverted T-shaped base frame, a T-shaped top seat frame, and a lifting screw. By adjusting the height of the vertical lathe jaws and their radial placement on the vertical lathe worktable, stable clamping and processing of the high-pressure steam chamber nozzle groove can be achieved.
It achieves stable clamping of high-pressure steam chamber nozzle slots of different heights and shapes, meets processing requirements, reduces tooling costs, and improves processing efficiency and the control accuracy of dimensional and positional tolerances.
Smart Images
Figure CN223960936U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of auxiliary devices for steam turbine processing, and more specifically, to a height-adjustable clamping device. Background Technology
[0002] The high-pressure steam chamber is the heart of the steam turbine, and the difficulty in machining the high-pressure steam chamber lies in how to machine the nozzle mounting slot. The high-pressure nozzles are installed in the nozzle slot, and the steam is blown through the nozzles onto the turbine rotor blades to do work. Therefore, the dimensional tolerances and positional requirements of the nozzle slot are very high, which is related to the efficiency and safety of the entire unit.
[0003] The shape of the high-pressure steam chamber makes vertical lathe clamping and centering difficult, further complicating the control of nozzle groove tolerances and positional requirements during machining. Because the steam chamber nozzle is an irregular product with highly irregular height and shape, such as… Figure 1 and 2 As shown, existing methods for machining high-pressure steam chamber nozzle slots typically involve welding three clamps onto the high-pressure steam chamber. Since the high-pressure steam chamber is a high-temperature component made of special materials, welding these clamps can easily cause cracks, affecting the safety of the unit. Furthermore, the vertical lathe's grippers often struggle to hold the clamps securely, resulting in significant vibration during machining. Even a slight increase in cutting force can cause slippage, causing the high-pressure steam chamber to "move," severely impacting dimensional and geometric tolerances. Therefore, clamping is extremely difficult, the workpiece is prone to movement, and machining efficiency is low.
[0004] Therefore, there is an urgent need for a clamping device that can efficiently process steam chamber nozzles and solve the processing problems of all steam chamber nozzle grooves. Utility Model Content
[0005] The purpose of this invention is to provide a height-adjustable clamping device that can adjust the different heights H of the steam chamber nozzle to meet the processing requirements of different steam chamber nozzle slots.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A height-adjustable clamping device includes an inverted T-shaped base frame, a T-shaped top seat frame, and a lifting screw. The inverted T-shaped base frame includes a base and a support plate disposed on the base. The T-shaped top seat frame includes a top seat and an insert plate disposed below the top seat. The insert plate has a U-shaped groove. The support plate is inserted into the U-shaped groove to form a sliding pair and is fixed by a set screw. The top seat is provided with a vertical car gripper. The lifting screw passes through the vertical car gripper and the top seat. The height of the vertical car gripper is controlled by rotating the lifting screw.
[0008] In a further technical solution, the vertical car gripper is mounted on the top seat by means of bolts and nuts.
[0009] In a further technical solution, the base is in the shape of an isosceles trapezoid, and the included angle between its two sides is the same as the included angle between adjacent T-slots on the vertical lathe workbench.
[0010] In a further technical solution, the base is in the shape of an isosceles trapezoid, and the included angle between its two sides is the same as the included angle between three T-slots on the vertical lathe worktable.
[0011] A further technical solution is that the base is provided with a U-shaped groove, and the clamping device passes through the slide groove and the T-shaped groove on the vertical car workbench to fix the base.
[0012] In a further technical solution, the clamping device includes a screw, and the screw is provided with a nut, a washer, a pressure plate and a T-block from top to bottom.
[0013] A further technical solution is that the bottom of the support plate is provided with a limiting step. Beneficial effects
[0014] Compared with the prior art, the present invention has the following significant advantages:
[0015] 1. This utility model can adjust the height of the vertical lathe clamps according to the height of the high-pressure steam chamber, and can complete the clamping, adjustment and processing of nozzle slots of all different high-pressure steam chambers.
[0016] 2. This utility model is designed for workpieces with irregular shapes such as nozzle grooves, which can be clamped conveniently and quickly. By using this device, the dimensional and positional tolerances of the high-pressure steam chamber nozzle grooves produced can fully meet the technical requirements of the drawings, and the cost of tooling is greatly reduced, while the processing efficiency is improved. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the high-pressure steam chamber.
[0018] Figure 2 for Figure 1 AA diagram in the image;
[0019] Figure 3 This is a schematic diagram of the structure of this utility model;
[0020] Figure 4 for Figure 2 AA diagram in the image;
[0021] Figure 5 This is a top view of the base frame;
[0022] Figure 6 This is a top view of the top support frame;
[0023] Figure 7 This is the front view of the top support frame;
[0024] Figure 8 This is a schematic diagram of the clamping device;
[0025] Figure 9 This is a schematic diagram of the structure of the present invention. Figure 1 (Before the lifting screw is raised);
[0026] Figure 10 This is a schematic diagram of the structure of the present invention. Figure 2 (After the lifting screw is raised);
[0027] Figure 11 This is a schematic diagram of the present invention installed on the vertical lathe workbench. Figure 1 ;
[0028] Figure 12 This is a schematic diagram of the present invention installed on the vertical lathe workbench. Figure 2 ;
[0029] The diagram is labeled as follows: 1. Base frame, 2. Lifting screw, 3. Top seat frame, 4. Set screw, 5. Nut, 6. Bolt, 7. Vertical lathe gripper, 3-1. Top seat, 3-2. Insert plate, 3-3. U-shaped groove, 1-1. Base, 1-2. Support plate, 1-3. Limiting step, 8. Vertical lathe worktable, 9. T-slot, 10. Clamping device, 10-1. Screw, 10-2. Nut, 10-3. Washer, 10-4. Pressure plate, 10-5. T-block, 11. Vertical lathe worktable, 12. High-pressure steam chamber. Detailed Implementation
[0030] The present invention will now be described in detail with reference to embodiments and application examples. It should be noted that the embodiments described are preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. The application and usage of the present invention are not limited to the application examples described. Example
[0031] like Figure 3-8 As shown, a height-adjustable clamping device includes an inverted T-shaped base frame 1, a T-shaped top seat frame 3, and a lifting screw 2. The inverted T-shaped base frame 1 includes a base 1-1 and a support plate 1-2 disposed on the base. The T-shaped top seat frame 3 includes a top seat 3-1 and an insert plate 3-2 disposed below the top seat 3-1. The insert plate 3-2 is provided with a U-shaped groove 3-3. The support plate 1-2 is inserted into the U-shaped groove 3-3 to form a sliding pair and is fixed by a set screw 4. The top seat 3-1 is provided with a vertical car gripper 7. The lifting screw 2 passes through the vertical car gripper 7 and the top seat 3-1. The height of the vertical car gripper 7 is controlled by rotating the lifting screw 2.
[0032] The vertical car clamp 7 is mounted on the top seat 3-1 by the cooperation of bolt 5 and nut 6.
[0033] The base 1-1 is in the shape of an isosceles trapezoid, and the included angle between its two sides is the same as the included angle between adjacent T-slots 9 on the vertical lathe worktable 8.
[0034] The base 1-1 is in the shape of an isosceles trapezoid, and the included angle between its two sides is the same as the included angle between the three T-slots on the vertical lathe worktable. This identical angle makes it easier to adjust the position of the base on the worktable, allowing the radial placement of the device on the vertical lathe worktable to be adjusted according to the size and location of the high-pressure steam chamber.
[0035] The base 1-1 is provided with a U-shaped groove 1-3, and the clamping device 10 passes through the U-shaped groove 1-3 and the T-shaped groove on the vertical lathe worktable to fix the base.
[0036] The clamping device 10 includes a screw 10-1, and from top to bottom, the screw 10-1 is provided with a nut 10-2, a washer 10-3, a pressure plate 10-4, and a T-block 10-5.
[0037] The bottom of the support plate 1-2 is provided with a limiting step 1-3.
[0038] The method of using this utility model is as follows:
[0039] 1. Install the vertical car clamps on the top seat frame 3 using bolts 6 and nuts 5. Place the insert plate of the top seat frame 3 into the recessed step of the support plate of the base frame 1 to form a sliding pair, and then tighten the set screw 4.
[0040] 2. Screw two lifting screws 2 through the two holes in the middle of the vertical clamping jaws and the two screw holes in the middle of the top seat 3 until the lifting screws 2 just touch the upper surface of the base frame 1.
[0041] 2. During use, the height of the vertical car clamp can be adjusted by rotating the lifting screw 2 according to the height of the high-pressure steam chamber.
[0042] 3. For example Figure 9-10 As shown, for different steam chamber nozzle heights H, the following can be achieved: First, loosen the four set screws 4, then simultaneously unscrew the two lifting screws 2 downwards. The lifting screws 2 will then press against the upper surface of the base 1-1, lifting the top seat 3 upwards through the threaded joint between the top seat 3 and the lifting screws 2. This will cause the vertical lathe clamping jaws to rise together. When the clamping jaws are in the appropriate clamping and adjustment position, the lifting stops. Then, tighten the set screws 4 to achieve clamping, adjustment, and processing of high-pressure steam chambers at different heights H.
[0043] 4. For example Figure 12As shown, they can be grouped into sets of three. Each base frame is fixed to the vertical lathe worktable by a clamping device. The T-block slides into the T-slot of the vertical lathe worktable until it reaches the bottom of the U-slot of the base frame. The screw is screwed into the T-block through the U-slot, and the base frame 1 is pressed firmly by the pressure plate, washer, and thick nut. At the same time, the included angle between the two waists of the base frame 1 is the same as the included angle between the three T-slots on the vertical lathe worktable. The same included angle makes it easier to adjust the position of the base on the worktable. The radial placement of this device can be adjusted on the vertical lathe worktable according to the size of the high-pressure steam chamber. This is used to tighten and align high-pressure steam chambers of different sizes.
[0044] This invention allows adjustment of the height of the vertical lathe clamps according to the height of the high-pressure steam chamber; simultaneously, the radial placement of the device on the vertical lathe worktable can be adjusted according to the size of the high-pressure steam chamber. This invention can complete the clamping, adjustment, and machining of nozzle grooves for all different high-pressure steam chambers. This mounting bracket provides a convenient, quick, and simple device for workpieces with highly irregular shapes. Using this device, the dimensional and positional tolerances of the machined high-pressure steam chamber nozzle grooves fully meet the technical requirements of the drawings, while significantly reducing tooling costs and improving machining efficiency. This invention can also be applied to the clamping and fixing of other irregularly shaped workpieces.
Claims
1. A height-adjustable clamping device, characterized in that: The device includes an inverted T-shaped base frame, a T-shaped top seat frame, and a lifting screw. The inverted T-shaped base frame includes a base and a support plate on the base. The T-shaped top seat frame includes a top seat and an insert plate under the top seat. The insert plate has a U-shaped groove. The support plate is inserted into the U-shaped groove to form a sliding pair and is fixed by a set screw. The top seat has a vertical car gripper. The lifting screw passes through the vertical car gripper and the top seat. The height of the vertical car gripper is controlled by rotating the lifting screw.
2. The height-adjustable clamping device according to claim 1, characterized in that: The vertical car clamps are mounted on the top seat using bolts and nuts.
3. The height-adjustable clamping device according to claim 1, characterized in that: The base is in the shape of an isosceles trapezoid, and the included angle between its two sides is the same as the included angle between adjacent T-slots on the vertical lathe workbench.
4. The height-adjustable clamping device according to claim 1, characterized in that: The base is in the shape of an isosceles trapezoid, and the included angle between its two sides is the same as the included angle between three T-slots on the vertical lathe worktable.
5. The height-adjustable clamping device according to claim 1, 3, or 4, characterized in that: The base is provided with a U-shaped groove, and the clamping device passes through the slide groove and the T-shaped groove on the vertical car workbench to fix the base.
6. The height-adjustable clamping device according to claim 5, characterized in that: The clamping device includes a screw, and from top to bottom, the screw is provided with a nut, a washer, a pressure plate, and a T-block.
7. The height-adjustable clamping device according to claim 1, characterized in that: The bottom of the support plate is provided with a limiting step.