Structure for automatically adjusting positioning clamp

Abstract

The utility model discloses a structure for automatically adjusting a positioning clamp, which comprises a base and a bottom plate positioning assembly arranged around a bottom plate, the base is provided with a vertical plate outer side positioning assembly, the vertical plate outer side positioning assembly comprises an oil cylinder extending unit and a self-adjusting positioning block unit, and the oil cylinder extending unit comprises an oil cylinder and a piston rod. The piston rod can rotate along the axis of the piston rod, the self-adjusting positioning block unit comprises a positioning block which is sleeved on the piston rod and connected with the piston rod through a bolt penetrating through the piston rod, the positioning block is provided with fixing points on two sides of the piston rod, and a first interval is arranged between the piston rod and the positioning block and used for the positioning block to rotate around the axis of the bolt. A bottom plate is positioned through the bottom plate positioning assembly, the vertical plate with rotational deformation or bending deformation is positioned through the fixing points, on the two sides of the piston rod, of the positioning blocks of the vertical plate outer side positioning assembly, then the vertical plate is fixed, and the size stability of a machining positioning datum plane and the stability of an aluminum alloy casting bottom plate in the subsequent machining process are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fixture, especially a structure of automatic adjustment positioning fixture. BACKGROUND

[0002] With the popularity of electric tools in various industries, the pursuit of higher quality, lightweight, portable electric tools will be the driving force for industry development. Because aluminum alloy material has good mechanical properties, light weight and good thermal conductivity, it is widely used in the electric tool industry. Figure 1 As shown in the figure, it is an aluminum alloy casting bottom plate formed by die casting, which includes a bottom plate and a ruler (hereinafter referred to as "vertical plate") perpendicular to the bottom plate. The verticality requirement of the vertical plate to the bottom plate is 0.2mm, and the parallelism requirement between the two end faces of the vertical plate is 0.1mm. To ensure the dimensional accuracy of this part, machining is usually selected after the die casting forming mold. On the machining center, the fixture uses a three-point positioning method to fix the position of the machined part. The three-point force is realized by three groups of hydraulic cylinders, and the vertical plate part is fixed by fixing the outer side of the vertical plate through two parallel fixed points on the fixed seat.

[0003] In the process of implementing the prior art, the inventors found that:

[0004] Based on the structural characteristics of the aluminum alloy casting, the outer end face of the vertical plate is generally set as the machining positioning reference surface. However, when the aluminum alloy casting bottom plate is formed by die casting, the vertical plate part belongs to deep cavity die casting, which is prone to slight rotational deformation or bending deformation when the mold is removed. When the fixture is fixed, the two parallel fixed points on the outer side of the vertical plate will contact and fix one fixed point due to rotational deformation or bending deformation, and the other fixed point will not be in contact with it. Obviously, this will cause the dimensional instability of the machining positioning reference surface, making it impossible to fix the vertical plate part of the aluminum alloy casting bottom plate, and further unable to ensure the stability of the aluminum alloy casting bottom plate during subsequent machining.

[0005] Therefore, the present application provides a technical solution that can fix the vertical plate, ensure the dimensional stability of the machining positioning reference surface, and ensure the stability of the aluminum alloy casting bottom plate during subsequent machining, to solve the technical problem of dimensional instability of the machining positioning reference surface in the prior art, which makes it impossible to fix the vertical plate part of the aluminum alloy casting bottom plate, and further unable to ensure the stability of the aluminum alloy casting bottom plate during subsequent machining. SUMMARY

[0006] The embodiments of the present application provide a technical solution that can fix the vertical plate, ensure the dimensional stability of the machining positioning reference surface, and ensure the stability of the aluminum alloy casting bottom plate during subsequent machining, to solve the technical problem of dimensional instability of the machining positioning reference surface in the prior art, which makes it impossible to fix the vertical plate part of the aluminum alloy casting bottom plate, and further unable to ensure the stability of the aluminum alloy casting bottom plate during subsequent machining.

[0007] Specifically, the structure of the automatic adjustment positioning fixture comprises a base, a bottom plate positioning assembly arranged around the base and used for positioning a bottom plate, and a vertical plate outer side positioning assembly arranged on the base and used for positioning a vertical plate, wherein the vertical plate outer side positioning assembly comprises an oil cylinder extension unit and a self-adjusting positioning block unit, the oil cylinder extension unit at least comprises an oil cylinder and a piston rod connected with the oil cylinder, the piston rod is rotatable along the axis of the piston rod, and the self-adjusting positioning block unit comprises a positioning block sleeved on the piston rod and connected with the piston rod through a pin, the positioning block is provided with fixing points on both sides of the piston rod, a first interval is arranged between the piston rod and the positioning block, and the positioning block is rotatable along the axis of the pin.

[0008] Further, the oil cylinder extension unit further comprises:

[0009] an oil cylinder seat connected with the oil cylinder and fixed on the base.

[0010] Further, the oil cylinder seat is further provided with an auxiliary limiting block, one end of the auxiliary limiting block is connected with the oil cylinder seat, the other end of the auxiliary limiting block is located below the positioning block, a second interval is arranged between the auxiliary limiting block and the positioning block.

[0011] Further, the positioning block is a square positioning block, and the square positioning block is provided with a sleeving hole used for sleeving the piston rod.

[0012] Further, the bottom plate positioning assembly comprises a plurality of hinge hydraulic positioning units, and each hinge hydraulic positioning unit comprises a hinge hydraulic unit, a pressing plate connected with the hinge hydraulic unit and used for pressing the bottom plate through the hinge hydraulic unit, and a positioning base block connected with the base and arranged at a position corresponding to the position where the pressing plate presses the bottom plate.

[0013] Further, the bottom plate positioning assembly further comprises a plurality of positioning pin positioning units, and each positioning pin positioning unit comprises a positioning pin base block arranged on the base and a positioning pin mounted on the positioning pin base block and inserted into the bottom plate for positioning the bottom plate.

[0014] The technical scheme provided by the embodiment has at least the following beneficial effects:

[0015] The structure of the automatic adjustment positioning fixture provided by the application can realize stable positioning of the bottom plate through the bottom plate positioning assembly when the aluminum alloy casting bottom plate is fixed by the fixture, and the positioning block of the vertical plate outer side positioning assembly can be rotated along the axis of the piston rod and rotated along the axis of the pin to realize positioning of the vertical plate with rotational deformation or bending deformation at the fixing points on both sides of the piston rod, so that the vertical plate part is fixed, the size stability of the machining positioning reference surface is ensured, and the stability of the aluminum alloy casting bottom plate during subsequent machining is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are intended to provide further understanding of the present application, form a part of the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0017] Figure 1 A structure schematic diagram of the die-cast aluminum alloy casting base plate provided for the embodiments of the present application;

[0018] Figure 2 A structure schematic diagram of the automatic adjustment positioning clamp provided for the embodiments of the present application;

[0019] Figure 3 A structure schematic diagram of the automatic adjustment positioning clamp positioning the aluminum alloy casting base plate provided for the embodiments of the present application;

[0020] Figure 4 A schematic diagram of the vertical plate outer side positioning assembly provided for the embodiments of the present application;

[0021] Reference signs:

[0022] Structure of the automatic adjustment positioning clamp-100;

[0023] Aluminum alloy casting base plate-1; base plate-10; vertical plate-11;

[0024] Base-2;

[0025] Base plate positioning assembly-3; hinge hydraulic positioning unit-31; hinge hydraulic unit-311; pressing plate-312; positioning base block-313; positioning pin positioning unit-32; positioning pin base block-321; positioning pin-322;

[0026] Vertical plate outer side positioning assembly-4;

[0027] Oil cylinder extension unit-41; oil cylinder-411; piston rod-412; oil cylinder base-413; auxiliary limiting block-414;

[0028] Self-adjusting positioning block unit-42; positioning block-421; fixed point-4211; bolt-422. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0030] Please refer to Figure 1This refers to a die-cast aluminum alloy base plate 1, comprising a base plate 10 and a scale perpendicular to the base plate 10. It should be noted that the scale is marked on the vertical plate; in this document, the scale is referred to as vertical plate 11. The aluminum alloy base plate 1 is 170mm long, 100mm wide, 45mm high, and has an arm thickness of 4mm. The production requirements for the aluminum alloy base plate 1 are: the perpendicularity of vertical plate 11 to base plate 10 must be 0.2mm, and the parallelism between the two end faces of vertical plate 11 must be 0.1mm. To ensure dimensional accuracy in these areas, machining is generally performed after die casting. During machining, considering the structural characteristics of the aluminum alloy casting, the inner end face of the vertical plate 11 is generally set as the machining positioning reference surface. However, when the aluminum alloy casting base plate 1 is die-cast, the vertical plate 11 is a relatively deep cavity die-casting part, which is prone to slight rotational or bending deformation during demolding. When the fixture is fixed, the two parallel fixing points 4211 on the outer side of the vertical plate 11 will be fixed in contact with the outer side of the vertical plate 11 due to rotational or bending deformation, while the other will not be in contact with it. As a result, when the fixture is fixed for machining, the aluminum alloy casting base plate 1 will shake, which leads to instability of the machining positioning reference surface dimension. It is impossible to fix the vertical plate of the aluminum alloy casting base plate 1, and thus the stability of the aluminum alloy casting base plate 1 cannot be guaranteed during subsequent machining.

[0031] The slight rotational or bending deformation that occurs during the die-casting of the vertical plate 11 can cause the two parallel fixing points 4211 on the outer side of the vertical plate 11 to fail to secure the plate. Figure 2 As shown, this application provides a structure 100 for an automatic adjustment positioning fixture, including a base 2, a base plate positioning assembly 3 surrounding the base 2 for positioning a base plate 10, and an outer plate positioning assembly 4 for fixing the outer side of the upright plate. Figure 4 As shown, the outer positioning assembly 4 of the upright plate includes a cylinder extension unit 41 and a self-adjusting positioning block unit 42. The cylinder extension unit 41 includes at least a cylinder 411 and a piston rod 412 connected to the cylinder. The piston rod 412 can rotate along the axis of the piston rod 412. The self-adjusting positioning block unit 42 includes a positioning block 421 sleeved on the piston rod 412 and connected through the piston rod 412 by a pin 422. The positioning block 421 has fixed points 4211 on both sides of the piston rod 412. A first gap is provided between the piston rod 412 and the positioning block 421 for the positioning block 421 to rotate about the axis of the pin 422.

[0032] Specifically, the aluminum alloy casting is fixed by setting the base plate positioning component 3 and the outer side positioning component 4 on the base plate 2.

[0033] The bottom plate positioning assembly 3 is used for positioning and fixing the aluminum alloy casting bottom plate 1. The bottom plate positioning assembly 3 comprises several hinge hydraulic positioning units 31. In the present application, the aluminum alloy casting bottom plate 1 is positioned by 3 groups of hinge hydraulic positioning units 31 installed on the base 2. The hinge hydraulic positioning unit 31 comprises: a hinge hydraulic unit 311, a pressing plate 312 connected to the hinge hydraulic unit 311 and used for pressing the bottom plate 10 by the hinge hydraulic unit 311, and a positioning base block 321 connected to the base 2 and arranged at a position corresponding to the position where the pressing plate 312 presses the bottom plate 10.

[0034] Meanwhile, the bottom plate positioning assembly 3 further comprises several positioning pin positioning units 32. In the present application, the aluminum alloy casting bottom plate 1 is positioned by 2 groups of positioning pin positioning units 32 installed on the base 2 and located at the bottom of the aluminum alloy casting bottom plate 1. The positioning pin positioning unit 32 comprises: a positioning pin base block 321 arranged on the base 2, and a positioning pin 322 installed on the positioning pin base block 321 and inserted into the bottom plate 10 for positioning the bottom plate 10.

[0035] The vertical plate outer positioning assembly 4 is used for positioning the vertical plate. The vertical plate outer positioning assembly 4 comprises an oil cylinder extending unit 41 and a self-adjusting positioning block unit 42. It can be understood that the oil cylinder extending unit 41 is used for positioning the positioning block 421 of the self-adjusting positioning block unit 42 to the vertical plate 11, thereby fixing the vertical plate 11.

[0036] Specifically, the oil cylinder extending unit 41 comprises an oil cylinder seat 413 fixed to the base 2, an oil cylinder connected to the oil cylinder seat 413, and a piston rod 412 connected to the oil cylinder. It can be understood that the extension of the piston rod 412 driven by the oil cylinder can make the self-adjusting positioning block unit 42 connected to the piston rod 412 extend.

[0037] It should be pointed out that the piston rod 412 can also rotate along the axis of the piston rod 412, that is, the positioning block 421 of the self-adjusting positioning block unit 42 can not only extend with the extension of the piston rod 412, but also rotate with the rotation of the piston rod 412. It can be understood that the rotation of the piston rod 412 makes the positioning block 421 of the self-adjusting positioning block unit 42 rotate.

[0038] It should also be pointed out that the place where the piston rod 412 is connected to the positioning block 421 can be columnar or flat as shown in the figure, so that the bolt 422 is inserted into the piston rod 412 connected to the positioning block 421.

[0039] The oil cylinder seat 413 is further provided with an auxiliary limiting block 414, one end of the auxiliary limiting block 414 is connected with the oil cylinder seat 413, and the other end is located below the positioning block 421, and a second interval is arranged between the auxiliary limiting block 414 and the positioning block 421. It should be pointed out that in order to prevent the positioning block 421 from rotating too much along the axis of the piston rod 412, the auxiliary limiting block 414 is arranged below the positioning block 421 to limit the positioning block 421. In a preferred embodiment provided in the present application, the second interval is set to 5mm.

[0040] The self-adjusting positioning block unit 42 includes a positioning block 421 sleeved on the piston rod 412 and connected through the pin 422 penetrating the piston rod 412. It can be understood that the self-adjusting positioning block unit 42 is used to realize the automatic adjustment of the positioning block 421. The automatic adjustment of the positioning block 421 is first realized by connecting the pin 422 penetrating the piston rod 412, that is, the pin 422 penetrates the positioning block 421 and the piston rod 412. On this basis, in order to realize the rotation of the positioning block 421 along the axis of the pin 422, an interval is arranged between the piston rod 412 and the positioning block 421, that is, an interval is arranged between the outer wall of the piston rod 412 and the inner wall of the positioning block 421 on the piston rod 412, thereby realizing the rotation of the positioning block 421 along the axis of the pin 422.

[0041] The positioning block 421 is a square positioning block 421, and a sleeving hole for sleeving on the piston rod 412 is formed in the square positioning block 421. It can be understood that the positioning block 421 can also be a positioning block 421 of other shapes in addition to the square positioning block 421, and the square positioning block 421 is preferred in the present application. In addition, the sleeving hole of the square positioning block 421 is larger than the piston rod 412 inserted into the sleeving hole, and it can be understood that this arrangement can realize the rotation of the positioning block 421 along the axis of the pin 422.

[0042] It can be known that the oil cylinder extension unit 41 of the vertical plate outside positioning assembly 4 can realize the extension of the positioning block 421 along with the extension of the piston rod 412, and the rotation of the positioning block 421 along with the rotation of the piston rod 412, and the self-adjusting positioning block 421 unit 42 can realize the rotation of the positioning block 421 along the axis of the pin 422, so it can be understood that the fixed points 4211 of the positioning block 421 on both sides of the piston rod 412 can rotate, extend and rotate along the axis of the pin 422, and fix the vertical plate which is deformed by rotation or bending.

[0043] When positioning is performed by the clamp of the present application, as shown in Figure 3As shown, the die-cast aluminum alloy casting bottom plate 1 is placed on the positioning pin 322 of the positioning pin base block 321 of the positioning pin unit 32 of the base 2, then the pressing plate 312 is controlled by the hinge hydraulic unit 311 to press the bottom plate 10 on the positioning base block 321, then the piston rod 412 of the oil cylinder extension unit 41 is extended, and combined with the deformation of the aluminum alloy casting bottom plate 1, it is rotated to realize the rotation of the positioning block 421 of the self-adjusting positioning block unit 42 along the axis of the piston rod 412, at the same time, the positioning block 421 of the self-adjusting positioning block unit 42 is rotated along the axis of the bolt 422, thereby ensuring that the fixed points 4211 on both sides of the positioning block 421 are fixed on the outer side of the vertical plate. In addition, in order to prevent the positioning block 421 from rotating too much along the axis of the piston rod 412, an auxiliary limiting block 414 is also provided to limit the positioning block 421.

[0044] It should be noted that the terms "comprising", "including", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0045] The above only describes the embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A structure for automatically adjusting a positioning jig, comprising a base, a base positioning assembly disposed around the base for positioning the base, characterized in that, The base is provided with a vertical plate outside positioning assembly for fixing the outside of the vertical plate, which comprises an oil cylinder extension unit and a self-adjusting positioning block unit. The oil cylinder extension unit comprises at least an oil cylinder and a piston rod connected with the oil cylinder. The piston rod can rotate along the axis of the piston rod. The self-adjusting positioning block unit comprises a positioning block connected with the piston rod through a bolt. The positioning block is provided with fixing points on both sides of the piston rod. A first interval is provided between the piston rod and the positioning block for the positioning block to rotate along the axis of the bolt.

2. The structure of claim 1, wherein The oil cylinder extension unit further comprises an oil cylinder seat connected with the oil cylinder and fixed to the base.

3. The structure of claim 2, wherein The oil cylinder seat is further provided with an auxiliary limiting block. One end of the auxiliary limiting block is connected with the oil cylinder seat, and the other end is located below the positioning block. A second interval is provided between the auxiliary limiting block and the positioning block.

4. The structure of claim 1, wherein The positioning block is a square positioning block, which is provided with a socket hole for connecting with the piston rod.

5. The structure of claim 1, wherein The base positioning assembly comprises a plurality of hinge hydraulic positioning units. The hinge hydraulic positioning unit comprises a hinge hydraulic unit, a pressing plate connected with the hinge hydraulic unit for controlling the pressing plate to press the base through the hinge hydraulic unit, and a positioning base block connected with the base and arranged at a position corresponding to the position where the pressing plate presses the base.

6. The structure of claim 1, wherein The base positioning assembly further comprises a plurality of positioning pin positioning units. The positioning pin positioning unit comprises a positioning pin base block arranged on the base, and a positioning pin installed on the positioning pin base block and inserted into the base for positioning the base.

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