Positioning fixture for three-disc workpiece welding

Abstract

The utility model discloses a positioning fixture for three-disc workpiece welding, including a cover body positioning assembly, an air duct cover plate positioning assembly and a support frame positioning assembly; the cover body positioning assembly includes a bottom plate, a pressure plate flatly pressed on the top surface of the cover body and multiple side positioning groups for pressing the side walls of the cover body; the support frame positioning assembly has three groups and is respectively arranged at the positions of the bottom plate corresponding to the left, middle and right sides of the front face of the cover body, and is located on the outside of the cover body, and each group of support frame positioning assemblies includes a support frame positioning seat, a support frame horizontal clamping mechanism and a support frame pressing mechanism; the air duct cover plate positioning assembly is arranged at the position of the bottom plate corresponding to the cover body air duct, and is located outside the cover body, and the air duct cover plate positioning assembly includes a pressing cylinder and a pressing frame arranged on the pressing cylinder, and the pressing frame is driven by the pressing cylinder to press the air duct cover plate to be welded on the outer wall of the air duct of the cover body. The utility model can reduce the work intensity of welders and improve the accuracy of welding.

Description

Technical Field

[0001] The utility model relates to the field of welding positioning, in particular to a positioning fixture for three-knife disc workpiece welding. Background Art

[0002] like Figure 2 The workpiece marked with 2 is a three-blade disc workpiece for a lawn mower. It is a workpiece welded by the fourth welding process in the production of the three-blade disc assembly. It is mainly composed of a cover body 23 formed by the first, second and third welding processes, an air duct cover plate 21 welded on the air duct opening on the side wall of the cover body 23, and three support frames 22 welded on the left, middle and right parts of the front face of the cover body.

[0003] In the prior art, when the air duct cover plate and the three support frames are welded on the cover body, they are all positioned manually by hand, that is, the operator presses the part to be welded against the cover body with one hand, and holds the welding gun with the other hand to perform the welding operation. This positioning method not only increases the work intensity of the welders, but also results in low positioning accuracy, affecting the overall accuracy of the workpiece, and therefore needs further improvement. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a three-disc workpiece welding positioning fixture, which can not only reduce the work intensity of welders, but also improve the welding accuracy.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A three-disc workpiece welding positioning fixture, characterized by comprising a cover body positioning assembly, an air duct cover plate positioning assembly and a support frame positioning assembly;

[0007] The cover body positioning assembly comprises a bottom plate for placing the cover body with the cover opening facing downward, a pressing plate pressed flat on the top surface of the cover body, and a plurality of side positioning groups arranged on the bottom plate along the side wall of the cover body and pressing the side wall of the cover body tightly;

[0008] The support frame positioning components have three groups and are respectively arranged on the left, middle and right positions of the bottom plate corresponding to the front face of the cover body, and are located on the outside of the cover body. Each group of support frame positioning components includes a support frame positioning seat, a support frame horizontal clamping mechanism and a support frame pressing mechanism;

[0009] The air duct cover plate positioning assembly is arranged at a position of the base plate corresponding to the air duct of the cover body and is located outside the cover body. The air duct cover plate positioning assembly includes a clamping cylinder and a clamping frame arranged on the clamping cylinder. The clamping frame is driven by the clamping cylinder to press the air duct cover plate to be welded onto the outer wall of the air duct of the cover body.

[0010] Preferably, the support frame positioning seat is arranged on the bottom plate, and includes an upper support plate for supporting the top wall of the support frame to be welded and a side support plate for abutting the left and right side walls of the support frame to be welded.

[0011] Preferably, the horizontal clamping mechanism of the support frame includes a clamping cylinder arranged on the base plate and two clamping blocks arranged on the clamping cylinder. The clamping blocks are located on the left and right sides of the support frame positioning seat, and the clamping cylinder drives the two clamping blocks to clamp on the left and right side walls of the support frame to be welded.

[0012] Preferably, the support frame pressing mechanism includes a pressing cylinder arranged on the bottom plate and a pressing rod arranged on the pressing cylinder. The pressing rod is located above the support frame positioning seat and is driven by the pressing cylinder to press the pressing rod against the top surface of the support frame to be welded.

[0013] Preferably, the side positioning group includes an inner support seat arranged on the base plate and located on the inner side of the cover body, and an external pressure cylinder arranged on the base plate and located on the outer side of the cover body, and the external pressure cylinder is connected to an external pressure block, and the external pressure cylinder presses the side wall of the cover body against the inner support seat through the external pressure block.

[0014] Preferably, the bottom plate is provided with a plurality of support columns and a support base for supporting the top wall of the cover body, the support base is provided with a vertical screw rod, and the screw rod is matched with a locking nut capable of pressing the pressure plate downward.

[0015] The advantages of the utility model are:

[0016] 1. Through the cover body positioning assembly, the air duct cover plate positioning assembly and the support frame positioning assembly, the cover body, the air duct cover plate and the three support frames to be welded can be positioned without the need for the welder to hold the position, which significantly improves the convenience and accuracy of welding;

[0017] 2. The pressure plate is pressed flat on the top surface of the cover body, which can shape and position the top surface of the cover body, avoiding the problem of deformation of the cover body when it is subjected to lateral pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a three-disc workpiece welding positioning fixture provided in this embodiment;

[0019] Figure 2 An exploded view of the three-disc workpiece welding positioning fixture provided in this embodiment;

[0020] Figure 3 A schematic diagram of the support frame positioning assembly provided in this embodiment. DETAILED DESCRIPTION

[0021] Combination Figures 1 to 3The utility model of the three-disc workpiece welding positioning fixture is further described.

[0022] A positioning fixture for three-disc workpiece welding, characterized in that it includes a cover body positioning assembly 1, an air duct cover plate positioning assembly 3 and a support frame positioning assembly 4. The cover body positioning assembly 1 includes a bottom plate 12 for placing the cover body 23 with the cover opening facing downward, a pressing plate 11 pressed flat on the top surface of the cover body 23, and multiple groups of side positioning groups 13 arranged on the bottom plate 12 along the side wall of the cover body 23 and pressing the side wall of the cover body 23; the support frame positioning assembly 4 has three groups and is respectively arranged on the left, middle and right positions of the bottom plate 12 corresponding to the front face 24 of the cover body 23, and is located on the outside of the cover body 23, and each group of support frame positioning assemblies 4 is It includes a support frame positioning seat 41, a support frame horizontal clamping mechanism 42 and a support frame pressing mechanism 43; the air duct cover plate positioning assembly 3 is arranged at the position of the bottom plate 12 corresponding to the air duct of the cover body 23, and is located outside the cover body 23. The air duct cover plate positioning assembly 3 includes a clamping cylinder 32 and a clamping frame 31 arranged on the piston rod of the clamping cylinder 32. The clamping frame 31 is driven by the clamping cylinder 32 to press the air duct cover plate 21 to be welded onto the outer wall of the air duct of the cover body 23.

[0023] Specific as Figure 3 As shown, the support frame positioning seat 41 includes a bottom block 411 fixed on the bottom plate 12 by bolts and located on the outside of the cover body 23 and corresponding to the left, middle and right sides of the front face of the cover body 23, an upper support plate 412 fixed on the upper surface of the bottom block 411 by bolts and supported by the top wall of the support frame 22 to be welded, and a side support plate 413 fixed on the left and right sides of the bottom block 411 by bolts and supported by the left and right side walls of the support frame 22 to be welded. In this embodiment, the front view of the support frame 22 to be welded is an inverted U-shaped structure, so when positioning the support frame 22 to be welded, the rear side of the support frame 22 to be welded is against the front face side wall of the cover body 23, and then the support frame 22 to be welded is placed from top to bottom on the support frame positioning seat 41 until the top wall of the support frame 22 to be welded is supported on the upper support plate 412, and at the same time, the two side walls of the support frame 22 to be welded are against the left and right side support plates 413, so that the initial positioning of the support frame 22 to be welded is achieved, that is, it can be quickly positioned.

[0024] The upper support plate 412 and the side support plate 413 are both connected to the bottom block 411 by bolts. Therefore, the upper support plate 412 and the side support plate 413 can be replaced so that the upper surface shape of the upper support plate 412 is compatible with the shape of the top wall of the support frame 22 to be welded, and the outer side surface of the side support plate 413 is compatible with the shape of the inner side surfaces of the two side walls of the support frame 22 to be welded, so as to provide stable support and positioning for the support frame 22 to be welded.

[0025] The support frame horizontal clamping mechanism 42 includes a clamping cylinder 421 disposed on the bottom plate 12 and located in front of the support frame positioning seat 41 and clamping blocks 422 disposed on two clamping fingers of the clamping cylinder 421. The two clamping blocks 422 are located on the left and right sides of the support frame positioning seat 41, and the clamping cylinder 421 drives the clamping blocks 422 to clamp on the side walls of the support frame 22 to be welded. During the initial positioning process of the support frame 22 to be welded, the clamping cylinder 421 drives the two clamping blocks 422 to be in an open state. After the initial positioning is completed, the clamping cylinder 421 clamps, so that the left and right clamping blocks 422 are clamped on the left and right side walls of the support frame 22 to be welded.

[0026] In order to further improve the stability of the support frame horizontal clamping mechanism 42 in clamping the support frame 22 to be welded, two positioning pins 423 distributed up and down are provided on the facing surfaces of the two clamping blocks 422. The positioning pins 423 correspond to the connecting holes on the two side walls of the support frame 22 to be welded. Therefore, when the two clamping blocks 422 are clamped, the two positioning pins 423 on the same clamping block 422 can be inserted into the connecting holes on the side walls of the support frame 22 to be welded, thereby further realizing positioning.

[0027] In order to allow the positioning pin 423 to be accurately inserted into the connecting hole, the diameter of the connecting hole is slightly larger than the diameter of the positioning pin 423, so the support frame 22 to be welded will shake slightly.

[0028] The support frame pressing mechanism 43 includes a pressing cylinder 431 which is arranged on the base plate 12 and is in a vertical state, and a pressing rod 432 which is arranged on the piston rod of the pressing cylinder 431. The rear end of the pressing rod 432 extends to the top of the support frame positioning seat 41, and is also located above the support frame 22 to be welded. The pressing rod 432 is driven by the pressing cylinder 431 to press on the top surface of the support frame 22 to be welded, and the support frame 22 to be welded is pressed so that the support frame 22 to be welded is completely fixed relative to the cover body 23, and the welding operation can be carried out.

[0029] In the clamping structure of the air duct cover 21, two fixing pins 321 are arranged front and back on the side of the clamping frame 31 facing the air duct cover 21. Correspondingly, there are connecting holes on the air duct cover 21. The air duct cover 21 is hung on the clamping frame 31 through the connecting holes, and then the clamping cylinder 32 is pressed against the outer wall of the corresponding air duct opening of the cover body 23 to achieve positioning.

[0030] like Figure 2As shown, on the bottom plate 12 and located on the inner side of the cover body 23, there are a plurality of support columns 5 and a support base 6 for supporting the inner top wall of the cover body 23. The plurality of support columns 5 and the support base 6 are evenly distributed on the bottom plate 12 to evenly support the cover body 23. A vertical screw rod 7 is provided on the support base 6, and a locking nut 8 is provided on the screw rod 7 to press the pressing plate 11 downward. At the same time, a round hole is provided on the pressing plate 11 for the upper end of the screw rod 7 to pass through, and the position of the screw rod 7 corresponds to the mounting hole on the top wall of the cover body 23, so that the upper end of the screw rod 7 can pass through the cover body 23 and the pressing plate 11 at the same time. When positioning the cover body 23, first remove the locking nut 8 from the screw rod 7, then put the cover body 23, and then press the pressing plate 11 flat on the upper surface of the cover body 23, and finally screw on the locking nut 8 to press the pressing plate 11 flat on the upper surface of the cover body 23.

[0031] In this embodiment, the area and outer contour of the pressing plate 11 are as close to the top surface of the cover body 23 as possible, and corresponding notches 111 are provided at positions of the pressing plate 11 corresponding to the parts of the cover body 23 to be welded, so that the pressing plate 11 can cover and press the top wall of the cover body 23 as much as possible for effective shaping.

[0032] The side positioning group 13 includes an inner support seat 133 arranged on the base plate 12 and located on the inner side of the cover body 23, and an external pressure cylinder 131 arranged on the base plate 12 and located on the outer side of the cover body 23. The external pressure cylinder 131 is connected to an external pressure block 132. The external pressure cylinder 131 presses the side wall of the cover body 23 against the inner support seat 133 through the external pressure block 132 to achieve positioning. The side wall is the side wall of the cover body in all directions, namely the left and right side walls, the rear side wall and the front side wall of the cover body.

[0033] During specific use, the cover body 23, the air duct cover plate 21 and the three support frames 22 to be welded can be positioned through the cover body positioning component 1, the air duct cover plate positioning component 3 and the support frame positioning component 4, so as to realize the overall positioning of the workpiece 2 without the need for welding personnel to hold the positioning, which significantly improves the convenience and accuracy of welding; the pressure plate 11 is flatly pressed on the top surface of the cover body 23, which can shape and position the top surface of the cover body 23, and avoid the problem of deformation of the cover body 23 when subjected to lateral pressure.

[0034] Unless otherwise specified, in the present utility model, if there are terms such as "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicating orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or position relationship in the present utility model are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0035] Unless otherwise specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A three-disc workpiece welding positioning fixture, characterized by: It includes a cover body positioning component, an air duct cover plate positioning component and a support frame positioning component; The cover body positioning assembly comprises a bottom plate for placing the cover body with the cover opening facing downward, a pressing plate pressed flat on the top surface of the cover body, and a plurality of side positioning groups arranged on the bottom plate along the side wall of the cover body and pressing the side wall of the cover body tightly; The support frame positioning components have three groups and are respectively arranged on the left, middle and right positions of the bottom plate corresponding to the front face of the cover body, and are located on the outside of the cover body. Each group of support frame positioning components includes a support frame positioning seat, a support frame horizontal clamping mechanism and a support frame pressing mechanism; The air duct cover plate positioning assembly is arranged at a position of the base plate corresponding to the air duct of the cover body and is located outside the cover body. The air duct cover plate positioning assembly includes a clamping cylinder and a clamping frame arranged on the clamping cylinder. The clamping frame is driven by the clamping cylinder to press the air duct cover plate to be welded onto the outer wall of the air duct of the cover body.

2. The three-disc workpiece welding positioning fixture according to claim 1 is characterized by: The support frame positioning seat is arranged on the bottom plate, and comprises an upper support plate for supporting the top wall of the support frame to be welded and side support plates for abutting the left and right side walls of the support frame to be welded.

3. The three-disc workpiece welding positioning fixture according to claim 2 is characterized by: The horizontal clamping mechanism of the support frame includes a clamping cylinder arranged on the base plate and two clamping blocks arranged on the clamping cylinder. The clamping blocks are located on the left and right sides of the support frame positioning seat, and the clamping cylinder drives the two clamping blocks to clamp on the left and right side walls of the support frame to be welded.

4. The three-disc workpiece welding positioning fixture according to claim 3 is characterized by: The support frame pressing mechanism includes a pressing cylinder arranged on the bottom plate and a pressing rod arranged on the pressing cylinder. The pressing rod is located above the support frame positioning seat and is driven by the pressing cylinder to press the pressing rod against the top surface of the support frame to be welded.

5. The three-disc workpiece welding positioning fixture according to claim 1 is characterized by: The side positioning group includes an inner support seat arranged on the bottom plate and located on the inner side of the cover body, and an external pressure cylinder arranged on the bottom plate and located on the outer side of the cover body. The external pressure cylinder is connected to an external pressure block, and the external pressure cylinder presses the side wall of the cover body against the inner support seat through the external pressure block.

6. The three-disc workpiece welding positioning fixture according to claim 1 is characterized by: The bottom plate is provided with a plurality of support columns and a support base for supporting the top wall of the cover body. The support base is provided with a vertical screw rod, and the screw rod is matched with a locking nut capable of pressing the pressure plate downward.

Images