A machining clamp for outer lifting frame

Abstract

The utility model relates to a kind of for outer lifting frame machining clamp, including bottom plate, support piece, compression assembly, side vertical positioning member and position adjusting wedge block piece;Support piece is fixed on bottom plate, the upper end of support piece is equipped with V-shaped positioning groove, and the groove bottom of V-shaped positioning groove is equipped with positioning column;Compression assembly includes support column, fixed column and pressing plate, support column is fixed on the upper end of support piece, fixed column is fixed on bottom plate, the axis of fixed column and support column is in the same plane, the one end of pressing plate is rotatably fixed on support column, the other end is detachably connected fixed column, and pressing plate movably abuts outer lifting frame;Side vertical positioning member is fixed on bottom plate, and the side of side vertical positioning member opposite outer lifting frame is mutually parallel with the plane where the axis of fixed column and support column is located;Position adjusting wedge block piece is fixed on bottom plate, and located below compression assembly.Compared with prior art, the utility model has the advantages of positioning clamping convenient operation, high precision, high production efficiency etc.

Description

Technical Field

[0001] This utility model relates to the field of fixtures, and in particular to a fixture for machining external lifting frames. Background Technology

[0002] The forklift mast's lifting frame is the core load-bearing structure of the forklift's lifting system. Powered by hydraulic pressure, it raises and lowers the mast, primarily supporting the vertical lifting of the forks and goods, and bearing dynamic loads during handling. Its structural design directly affects the forklift's stability, load-bearing capacity, and operational efficiency.

[0003] The high precision requirements and irregular shape of the external lifting frame place stringent demands on the machining fixtures. Traditional fixtures require cumbersome positioning and clamping steps and have significant shortcomings in terms of positioning accuracy, welding deformation control, and automation adaptation.

[0004] Commonly used clamps include three-jaw and four-jaw chucks for machine tools, vises, and T-shaped worktables. For example, utility model publication CN109128237A discloses a clamping system and method for machining the outer wall of thin-walled cylindrical parts. The clamping system comprises a central shaft, a fixed baffle, a compression spring, a double-ended stud, washers, an adjusting nut, a connecting rod, an elastic body, a movable baffle, a positioning nut, a locking nut, and connecting bolts. This clamping system can adjust the axial clamping force and radial support force according to the different axial and radial stiffness of the workpiece; it can also measure the magnitude of the axial clamping force, radial support force, and workpiece deformation.

[0005] However, the existing fixtures mentioned above are all standardized general-purpose fixtures, which can adapt to the processing requirements of various workpieces within a certain range, but their application still has certain limitations:

[0006] 1. Low efficiency: General-purpose fixtures require special adjustments and positioning operations when adapting to different workpieces, which increases production time and reduces production efficiency.

[0007] 2. Precision limitations: General-purpose fixtures may not be able to meet the positioning accuracy and clamping stability requirements of specific workpieces, especially for machining workpieces with irregular shapes.

[0008] 3. Insufficient specialization: General-purpose fixtures may not meet the special requirements of specific machining tasks, such as specific clamping force, positioning accuracy, or space limitations. Utility Model Content

[0009] The purpose of this utility model is to overcome the shortcomings of the existing technology, such as cumbersome positioning and clamping process, low production efficiency and limited positioning accuracy, and to provide a fixture for processing external lifting frames.

[0010] The objective of this utility model can be achieved through the following technical solutions:

[0011] This solution provides a jig for machining an external lifting frame, including a base plate, a support member, a clamping assembly, a side-standing positioning member, and an adjusting wedge block; the support member is fixed on the base plate, and the upper end of the support member is provided with a V-shaped positioning groove, and a positioning post is installed at the bottom of the V-shaped positioning groove;

[0012] The clamping assembly includes a support column, a fixed column, and a pressure plate. The support column is fixed to the upper end of the support member, and the fixed column is fixed to the base plate and located on the side of the support column near the V-shaped positioning groove. The axes of the fixed column and the support column are in the same plane. One end of the pressure plate is rotatably fixed to the support column, and the other end is detachably connected to the fixed column. The pressure plate movably abuts against the outer lifting frame. The side positioning component is fixed to the base plate, and the side of the side positioning component facing the outer lifting frame is parallel to the plane containing the axes of the fixed column and the support column. The adjusting wedge is fixed to the base plate and located below the clamping assembly.

[0013] Preferably, the clamping assembly further includes a locking fastener and a contact block; the end of the pressure plate away from the supporting column is provided with a slot, the width of the slot being greater than the diameter of the fixed column, the locking fastener is installed on the end of the pressure plate near the slot, and the locking fastener is connected to the fixed column; the pressure plate is provided with an installation groove, the contact block is rotatably fixed in the installation groove, and the lower surface of the contact block matches the shape of the upper surface of the outer lifting frame.

[0014] Preferably, the upper end of the fixed column is provided with a threaded section, and the locking component includes a fixing pin, a washer, and a clamping nut;

[0015] One end of the gasket is fixed to the pressure plate by a fixing pin, and the other end is provided with a bayonet that mates with the threaded section. The bayonet engages with the threaded section, and the clamping nut is installed on the threaded section to connect and fix the gasket and the pressure plate to the column.

[0016] Preferably, the gasket has a hook-shaped structure, a notch is provided on one side of the bayonet, the gasket is rotatably fixed to the pressure plate by a fixing pin, and the width of the slot is greater than the width of the opposite sides of the clamping nut.

[0017] Preferably, the adjusting wedge includes a lifting rod and a wedge.

[0018] The base plate is provided with a limiting groove that cooperates with the wedge block, and the wedge block is movably installed in the limiting groove; the lifting rod is rotatably fixed on the base plate, one end of the lifting rod is movably connected to the wedge block, and the other end is provided with a tightening nut for fixing the wedge block.

[0019] Preferably, the angle between the upper end face and the bottom face of the wedge is 18-19 degrees.

[0020] Preferably, the support member is a T-shaped structure, the V-shaped positioning groove includes a first positioning surface and a second positioning surface, and the positioning post is vertically fixed on the first positioning surface.

[0021] Preferably, connecting chucks are symmetrically installed at both ends of the base plate.

[0022] Preferably, the side-standing positioning component includes a side-standing plate and positioning screws. The positioning screws are vertically and rotatably fixed to the side-standing plate. The number of positioning screws is at least three, and the positioning screws are distributed in a triangular array on the side of the side-standing plate facing the outer lifting frame.

[0023] Preferably, the base plate is provided with an operating slot, which is located on the side of the adjusting wedge block away from the side-standing positioning component.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) This solution uses the side of the V-shaped positioning groove and the positioning column for end positioning, and the positioning can be achieved by lifting and lowering the bottom adjusting wedge block. This simplifies the work of clamping the workpiece and changing the work station, eliminating the need for drawing lines and alignment, thereby shortening the auxiliary time of the process, facilitating operation, and improving production efficiency. Moreover, the positioning structure of each part is matched with the structure of the external lifting frame, which has higher positioning accuracy compared with general positioning fixtures.

[0026] (2) By using a notched shim and rotating it, the clamping nut can be loosened to a certain extent. Then, the shim can be rotated to disengage the threaded section from the notch, allowing the pressure plate to be opened. This shim allows the pressure plate to be loosened and the workpiece removed without the nut being fully unscrewed, reducing clamping time, improving the processing efficiency of the external lifting frame, and allowing for flexible adjustment of the workpiece clamping force to ensure the stability of the fixation. Attached Figure Description

[0027] Figure 1 This is a first-view structural schematic diagram of the external lifting frame machining fixture provided by this utility model;

[0028] Figure 2 This is a structural schematic diagram of the external lifting frame machining fixture provided by this utility model from a second perspective;

[0029] Figure 3 A schematic diagram of the external lifting frame provided by this utility model;

[0030] Figure 4 A schematic diagram of the structure of the external lifting frame clamp provided by this utility model after clamping;

[0031] Figure 5 A schematic diagram of the structure of the external lifting frame clamp provided by this utility model after clamping;

[0032] In the diagram: 1. Base plate, 2. Support component, 3. Support column, 4. Fixed column, 5. Pressure plate, 6. Locking fastener, 7. Contact block, 8. Side positioning component, 9. Adjustment wedge, 10. Outer lifting frame, 11. Connecting chuck; 21. V-shaped positioning groove, 22. Positioning column, 61. Fixing pin, 62. Washer, 63. Pressure nut, 81. Side plate, 82. Positioning screw, 91. Lifting rod, 92. Wedge, 101. Operating slot. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] Example 1

[0040] like Figures 1 to 5 As shown, this embodiment provides a jig for processing an external lifting frame, including a base plate 1, a support member 2, a support column 3, a fixed column 4, a pressure plate 5, a locking member 6, a contact block 7, a side positioning member 8, and an adjusting wedge block 9;

[0041] Support member 2 is fixed on base plate 1. The upper end of support member 2 is provided with V-shaped positioning groove 21. Positioning column 22 is installed at the bottom of V-shaped positioning groove 21. Support column 3 is fixed on the upper end of support member 2. Fixed column 4 is fixed on base plate 1 and located on the side of support column 3 close to V-shaped positioning groove 21. The axis of fixed column 4 and support column 3 are in the same plane.

[0042] One end of the pressure plate 5 is rotatably fixed to the support column 3, and the other end is provided with a slot; the pressure plate 5 is provided with an installation groove 51, and the contact block 7 is rotatably fixed in the installation groove 51 for pressing and limiting the top of the outer lifting frame 10; the locking fastener 6 is installed on the end of the pressure plate 5 near the slot for connecting the pressure plate 5 and the fixed column 4.

[0043] The side-standing positioning component 8 is fixed on the base plate 1. The side of the side-standing positioning component 8 facing the outer lifting frame 10 is parallel to the plane containing the axes of the fixed column 4 and the support column 3. The adjusting wedge block 9 is fixed on the base plate 1 and located between the support component 2 and the fixed column 4. It is used to push the outer lifting frame 5 to rotate around the top of the positioning column 22.

[0044] Position the front end of the outer lifting frame 10 against the side positioning piece 8, and place the right front end of the outer lifting frame 10 into the V-shaped positioning groove 21, with the lower end supported by the positioning post 22. Place the bottom of the outer lifting frame 10 on the adjusting wedge piece 9, and adjust the height of the adjusting wedge piece 9 so that the right end face of the outer lifting frame 10 abuts against one side of the V-shaped positioning groove 21, thus completing the positioning. Rotate the pressure plate 5 so that the contact block 7 abuts against the top of the outer lifting frame 10, and use the locking piece 6 to connect the pressure plate 5 to the fixed post 4, thus completing the clamping and fixing of the outer lifting frame 10.

[0045] End positioning is achieved through the side of the V-shaped positioning groove and the positioning post, and positioning can be realized by lifting and lowering the bottom adjusting wedge block 9. This simplifies the workpiece clamping and station change work, eliminating the need for drawing lines and alignment, thereby shortening the auxiliary time of the process, facilitating operation, and improving production efficiency. Moreover, the positioning structure of each part cooperates with the structure of the external lifting frame, and has higher positioning accuracy compared with general positioning fixtures.

[0046] Preferred implementation methods, such as Figure 2 As shown, the upper end of the fixed column 4 is provided with a threaded section, and the locking component 6 includes a fixing pin 61, a washer 62 and a clamping nut 63;

[0047] One end of the gasket 62 is fixed to the pressure plate 5 by a fixing pin 61, and the other end is provided with a retainer that mates with the threaded section. The retainer engages with the threaded section, and the clamping nut 63 is installed on the threaded section to connect and fix the gasket 62 and the pressure plate 5 to the column 4. The gasket can be a ring-shaped sleeve that is fitted onto the threaded section, but the nut needs to be removed, which is more cumbersome.

[0048] Furthermore, the gasket 62 has a hook-shaped structure with a notch on one side of the slot. The gasket 62 can be rotatably fixed to the pressure plate 5 by the fixing pin 61, and the width of the slot is greater than the width of the opposite side of the clamping nut 63.

[0049] By using a notched shim 62, and by rotating the shim 62, the clamping nut 63 is loosened to a certain extent. Then, the shim 62 can be rotated to disengage the threaded section from the notch, allowing the pressure plate 5 to be rotated and opened. This shim allows the pressure plate to be loosened and the workpiece removed without the nut being fully unscrewed, reducing clamping time and improving the processing efficiency of the external lifting frame.

[0050] Preferred implementation methods, such as Figure 1 As shown, the adjusting wedge block 9 includes a lifting rod 91 and a wedge block 92.

[0051] The base plate 1 is provided with a limiting groove that mates with the wedge block 92, and the wedge block 92 is movably installed in the limiting groove; the lifting rod 91 is rotatably fixed on the base plate 1, one end of the lifting rod 91 is movably connected to the wedge block 92, and the other end is provided with a tightening nut for fixing the wedge block 92. The angle between the upper end face and the bottom face of the wedge block 92 is 18.5 degrees.

[0052] By utilizing the inclination of the upper end face of the wedge block 92, the lower left end of the outer lifting frame 10 is raised and rotated around the positioning column, so that the right surface of the outer lifting frame 10 is attached to the inclined right side face of the V-shaped positioning groove 21. The adjustment is convenient and the positioning is efficient. The wedge block 92 and the second positioning surface limit the left and right degrees of freedom of the outer lifting frame.

[0053] In this embodiment, the support member 2 has a T-shaped structure, and the V-shaped positioning groove 21 includes a first positioning surface and a second positioning surface. The positioning column 22 is vertically fixed to the first positioning surface. A through hole is provided on the side wall of the upper end of the T-shaped V-shaped positioning groove 21 at the position of the second positioning surface, dividing the second positioning surface into two sections. This reduces the base area with the right surface of the outer lifting frame and avoids over-positioning on the right surface. Furthermore, fixing the support column within the through hole makes the structure more compact and improves its stability.

[0054] Within the base plate 1, connecting chucks 11 are symmetrically installed at both ends. These connecting chucks 11 connect to mechanisms such as rotating columns, facilitating subsequent processing.

[0055] In this embodiment, the side-standing positioning component 8 includes a side-standing plate 81 and positioning screws 82. The positioning screws 82 are vertically and rotatably fixed on the side-standing plate 81. There are at least three positioning screws 82, and each positioning screw 82 is distributed in a triangular array on the side of the side-standing plate 81 facing the outer lifting frame 10.

[0056] The front positioning surface is determined by the front end of the three positioning screws 82, which limits the front and rear degrees of freedom of the outer lifting frame 10, ensuring the accuracy of its surface positioning and avoiding over-positioning.

[0057] Optionally, the base plate 1 is provided with an operating slot 101, which is located on the side of the adjusting wedge block 9 away from the side-standing positioning block 8. By providing an operating slot on the base plate 1, it is convenient to move the outer lifting frame and to perform subsequent processing operations on the outer lifting frame by the mechanism.

[0058] This embodiment also provides the operation process for the external lifting frame machining fixture, including the following steps:

[0059] The right end of the outer lifting frame 10 is placed in the V-shaped positioning groove 21 and positioned based on the positioning column 22, while the left end is placed on the adjusting wedge block 9.

[0060] Adjust the positioning wedge block 9 to raise the lower left end of the outer lifting frame 10, so that the right surface of the outer lifting frame 10 abuts against the side of the V-shaped positioning groove 21;

[0061] The front end face of the outer lifting frame 10 is pressed against the side positioning component 8 to complete the initial positioning of the outer lifting frame;

[0062] Rotate the pressure plate 25 to bring the lower end of the contact block 7 against the top of the outer lifting frame 10, and fix the movable end of the pressure plate 5 to the fixed column 4 through the locking fastener 6 to complete the clamping of the outer lifting frame.

[0063] Specifically, during fixing, the right side of the workpiece is pressed against the positioning post on the support 2. Two positioning posts are symmetrically arranged before and after the first positioning surface. The wedge block with an inclination angle of 18.5° is raised by the lifting rod 91 until the right surface of the workpiece is pressed against the second positioning surface on the support. The position of the wedge block is fixed by tightening the nut and a supporting force is applied. The front surface of the workpiece is pressed against the three screws on the side plate to determine the position of the workpiece and complete the initial positioning.

[0064] Based on the arc groove on the upper surface of the outer lifting frame, a matching arc surface is set on the lower surface of the contact block. Through the rotation of the pressure plate, the arc surface of the contact block is pressed against the irregular arc surface at the upper end of the workpiece 2, generating effective pressure. The shim is clamped under the clamping nut of the fixed column, and the clamping nut is tightened to apply pressure to clamp the workpiece, restricting the Y and Z degrees of freedom of movement, thus completing the clamping of the workpiece.

[0065] Featuring a specially designed positioning and clamping system that precisely matches the workpiece's shape and dimensions, this system facilitates worker operation and improves production efficiency. It simplifies workpiece clamping and station switching, eliminating the need for marking and alignment, thus reducing auxiliary time. It ensures workpiece machining accuracy by quickly and accurately positioning and clamping the workpiece, guaranteeing its stability during processing.

[0066] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A fixture for machining external lifting frames, characterized in that, It includes a base plate (1), a support member (2), a clamping assembly, a side-standing positioning member (8), and an adjusting wedge block (9); the support member (2) is fixed on the base plate (1), and the upper end of the support member (2) is provided with a V-shaped positioning groove (21), and a positioning column (22) is installed at the bottom of the V-shaped positioning groove (21). The clamping assembly includes a support column (3), a fixed column (4), and a pressure plate (5). The support column (3) is fixed to the upper end of the support member (2). The fixed column (4) is fixed on the base plate (1) and located on the side of the support column (3) near the V-shaped positioning groove (21). The axes of the fixed column (4) and the support column (3) are in the same plane. One end of the pressure plate (5) is rotatably fixed on the support column (3), and the other end is detachably connected to the fixed column (4). The pressure plate (5) moves against the outer lifting frame (10). The side positioning member (8) is fixed on the base plate (1). The side positioning member (8) is parallel to the plane containing the axes of the fixed column (4) and the support column (3) on the side of the outer lifting frame (10). The adjusting wedge (9) is fixed on the base plate (1) and located below the clamping assembly.

2. A jig for machining an external lifting frame according to claim 1, characterized in that, The clamping assembly also includes a locking fastener (6) and a contact block (7); the end of the pressure plate (5) away from the supporting column (3) is provided with a slot, the width of the slot is greater than the diameter of the fixed column (4), the locking fastener (6) is installed on the end of the pressure plate (5) near the slot, and the locking fastener (6) is connected to the fixed column (4); the pressure plate (5) is provided with an installation groove (51), the contact block (7) is rotatably fixed in the installation groove (51), and the lower surface of the contact block (7) matches the shape of the upper surface of the outer lifting frame (10).

3. A jig for machining an external lifting frame according to claim 2, characterized in that, The upper end of the fixed column (4) is provided with a threaded section. The locking component (6) includes a fixing pin (61), a washer (62) and a clamping nut (63). One end of the washer (62) is fixed to the pressure plate (5) by the fixing pin (61), and the other end is provided with a buckle that cooperates with the threaded section. The buckle engages with the threaded section, and the clamping nut (63) is installed on the threaded section.

4. A jig for machining an external lifting frame according to claim 3, characterized in that, The gasket (62) has a hook-shaped structure, and a notch is provided on one side of the slot. The gasket (62) can be rotatably fixed to the pressure plate (5) by a fixing pin (61). The width of the slot is greater than the width of the opposite side of the clamping nut (63).

5. A jig for machining an external lifting frame according to claim 1, characterized in that, The adjusting wedge (9) includes a lifting rod (91) and a wedge (92). The base plate (1) is provided with a limiting groove that cooperates with the wedge (92). The wedge (92) is movably installed in the limiting groove. The lifting rod (91) is rotatably fixed on the base plate (1). One end of the lifting rod (91) is movably connected to the wedge (92), and the other end is provided with a tightening nut.

6. A jig for machining an external lifting frame according to claim 5, characterized in that, The angle between the upper end face and the bottom face of the wedge (92) is 18-19 degrees.

7. A jig for machining an external lifting frame according to claim 1, characterized in that, The support member (2) has a T-shaped structure, the V-shaped positioning groove (21) includes a first positioning surface and a second positioning surface, and the positioning column (22) is vertically fixed on the first positioning surface.

8. A jig for machining an external lifting frame according to claim 1, characterized in that, Connecting chucks (11) are symmetrically installed at both ends of the base plate (1).

9. A jig for machining an external lifting frame according to claim 1, characterized in that, The side-standing positioning component (8) includes a side plate (81) and positioning screws (82). The positioning screws (82) are vertically and rotatably fixed on the side plate (81). The number of positioning screws (82) is at least three. Each positioning screw (82) is distributed in a triangular array on the side of the side plate (81) facing the outer lifting frame (10).

10. A jig for machining an external lifting frame according to claim 1, characterized in that, The base plate (1) is provided with an operation slot (101), which is located on the side of the adjustment wedge block (9) away from the side-standing positioning block (8).

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