Hydraulic clamp for precision grinding

Abstract

The utility model belongs to the technical field of machining equipment relates to a hydraulic clamp for precision grinding machining, including base plate, hydraulic cylinder and support, the top of base plate is installed with the top plate, support is provided with four, two supports can be detachably installed in the left end of top plate, and the other two supports can be detachably installed in the right end of top plate, and the left two supports and the right two supports are spaced distribution along the front -back direction, and the interval of front -back two supports is adjustable, the top of each support is installed with first hydraulic cylinder, and the outer end of piston rod of each first hydraulic cylinder is fixedly installed with the clamping plate. The hydraulic clamp can be installed on the workbench of existing precision grinding machining equipment for clamping and fixing precision parts, can adjust the interval between the left two first hydraulic cylinders and the right two first hydraulic cylinders, makes four first hydraulic cylinders can hold precision parts with different length size in the front -back direction, can increase the application range of the hydraulic clamp.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing equipment technology, and specifically relates to a hydraulic clamp for precision grinding of parts. Background Technology

[0002] Fixtures are essential equipment in the grinding of mechanical workpieces, providing stable clamping force to prevent workpiece loosening and precisely clamping the workpiece in a predetermined position. Commonly used fixtures mainly include lead screw fixtures and hydraulic fixtures. Lead screw fixtures are mechanical fixtures, relying primarily on the helical action of the screw thread to propel the fixture. However, due to the influence of thread precision, the clamping accuracy of lead screw fixtures is lower than that of hydraulic fixtures. For example, one less turn of the screw thread may result in insufficient clamping force, easily causing the workpiece to loosen during grinding; one more turn may result in excessive clamping force, easily deforming the workpiece. Especially in the grinding of precision parts, hydraulic fixtures offer higher clamping accuracy than lead screw fixtures, making it easier to control the clamping force on precision parts.

[0003] However, existing hydraulic clamps still have some shortcomings. For example, a title and abstract search in the Chinese Patent Publication Database using the search term "precision parts and machining and hydraulics and clamping" yielded several relevant patents. Among them, patent CN222404567U discloses a hydraulic device for machining precision parts, specifically involving a hydraulic clamp that uses four sets of hydraulic clamping components to clamp the workpiece from all four sides, achieving multi-point support and uniform clamping. However, the problem with the above-mentioned existing hydraulic clamps for clamping precision parts is that the distance between the two hydraulic clamping components on the same side of the workpiece is not adjustable, and the clamping point height of each hydraulic clamping component on the workpiece is not adjustable, making it a special clamp for clamping specific types of precision parts. This also leads to the poor universality of the above-mentioned existing hydraulic clamps. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model proposes a hydraulic clamp for precision grinding, which aims to solve the problem mentioned in the background art that the non-adjustable spacing between two hydraulic clamping components on the same side leads to poor universality.

[0005] This utility model is achieved through the following technical solution:

[0006] A hydraulic fixture for precision grinding of parts includes a base plate, hydraulic cylinders, and supports. A top plate is mounted parallel to the base plate. Four supports are provided, two of which are detachably mounted on the left end of the top plate, and the other two are detachably mounted on the right end of the top plate. The two supports on the left end and the two supports on the right end of the top plate are spaced apart in the front-to-back direction, and the spacing between the front and back supports is adjustable. A first hydraulic cylinder is mounted at the top of each support. The piston rod of each first hydraulic cylinder extends horizontally in the left-to-right direction, and a clamping plate is fixedly mounted on the outer end of the piston rod of each first hydraulic cylinder. The two first hydraulic cylinders on the left and the two on the right are connected to the first hydraulic cylinders on the right. The two first hydraulic cylinders are arranged facing each other, so that the four clamping plates are located between the left and right first hydraulic cylinders. The four first hydraulic cylinders can be used to clamp precision parts placed at the center of the top surface of the top plate from the left and right sides. By disassembling and assembling each bracket, the distance between the two brackets on the left side of the top plate in the front-back direction can be adjusted, and the distance between the two brackets on the right side of the top plate in the front-back direction can be adjusted. This allows the distance between the two first hydraulic cylinders on the left side and the two first hydraulic cylinders on the right side in the front-back direction to be adjusted, so that the four first hydraulic cylinders can cooperate to clamp precision parts with different lengths in the front-back direction, thus increasing the applicability of the hydraulic clamp.

[0007] Furthermore, the top plate includes a platform plate for supporting precision parts and an outer plate for mounting brackets; a support column for supporting the platform plate is provided between the platform plate and the base plate, the platform plate is located inside the outer plate, and a channel for the support column to pass through is opened in the center of the outer plate. Four brackets are mounted on the outer plate. Multiple second hydraulic cylinders for supporting the outer plate are provided between the outer plate and the base plate. By controlling the synchronous extension and retraction of the piston rods of each second hydraulic cylinder, the lifting and lowering of the outer plate can be controlled, thereby adjusting the height of the four first hydraulic cylinders. This adjusts the clamping point height of the four first hydraulic cylinders on the precision parts placed at the center of the top surface of the top plate, which is suitable for clamping and fixing precision parts of different heights.

[0008] Furthermore, each of the clamping plates is equipped with a pressure sensor on its inner side for measuring the clamping force of the first hydraulic cylinder on the precision part. The measurement data from each pressure sensor can reflect the clamping status of each first hydraulic cylinder around the precision part in real time.

[0009] Furthermore, the outer plate has eight sliding grooves for mounting four brackets, each extending in the front-to-back direction; each bracket has two sliding grooves spaced apart on the left and right sides at its bottom end, and the bracket is fastened to the two sliding grooves by at least one set of bolt and nut assemblies, thereby enabling the bracket to be detachably installed on the outer plate. Each bracket is fixed by at least two sets of bolt and nut assemblies, ensuring its reliability on the outer plate; after loosening the bolt and nut assemblies on the bracket, the position of the bracket can be moved in the front-to-back direction, thereby adjusting the distance between the front and rear first hydraulic cylinders.

[0010] Furthermore, the top left walls of the two left supports on the outer perimeter plate and the top right walls of the two right supports on the outer perimeter plate are welded or integrally formed with perforated plates. The two perforated plates on the two left supports and the two perforated plates on the two right supports are respectively connected by tie rod and nut assemblies, thereby enhancing the reliability of the installation structure between the two left supports on the outer perimeter plate and the two right supports on the outer perimeter plate, and reducing the probability of the supports moving during the clamping process of the first hydraulic cylinder.

[0011] Furthermore, the support column is a third hydraulic cylinder, which can adjust the height of the platform plate, thereby increasing the adjustable height difference range between the platform plate and the outer plate.

[0012] Furthermore, the shape of the channel is adapted to the shape of the platform plate, and the platform plate can pass through the channel in the vertical direction, so that the platform plate can not only be higher than the outer plate, but also lower than the outer plate, making the adjustable height difference between the platform plate and the outer plate more extensive, which is suitable for clamping precision parts of different heights.

[0013] As can be seen from the above technical solution, the hydraulic fixture for precision grinding provided by this utility model has the following advantages:

[0014] This hydraulic clamp can be installed on the worktable of existing precision parts grinding equipment to clamp and fix precision parts. The top plate can be used to support and place precision parts. By disassembling and assembling each bracket, the distance between the two brackets on the left side and the two brackets on the right side of the top plate in the front-back direction can be adjusted. This allows the distance between the two first hydraulic cylinders on the left side and the two first hydraulic cylinders on the right side in the front-back direction to be adjusted. This enables the four first hydraulic cylinders to cooperate in clamping precision parts with different lengths in the front-back direction, thus increasing the applicability of the hydraulic clamp. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is the right view of the present invention.

[0018] Figure 3 This is a top view of the present invention.

[0019] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction.

[0020] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure in the middle BB direction.

[0021] The components in the diagram are named as follows: 1. Base plate; 1.1. Mounting groove; 2. Top plate; 2.1. Platform plate; 2.2. Outer plate; 2.3. Slide groove; 2.4. Channel; 3. Bracket; 4. First hydraulic cylinder; 5. Clamping plate; 6. Pressure sensor; 7. Orifice plate; 8. Pull screw nut assembly; 9. Second hydraulic cylinder; 10. Support column. Detailed Implementation

[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0023] In the description of this application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "front", "back", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0024] A hydraulic fixture for precision grinding, such as Figure 1 As shown, it mainly consists of a base plate 1, a hydraulic cylinder, a top plate 2, a bracket 3, a clamping plate 5, and a pressure sensor 6.

[0025] like Figure 1As shown, the left end, right end, front end and rear end of the substrate 1 are all provided with mounting grooves 1.1 through which bolts can pass. The substrate 1 can be mounted on the worktable of a precision grinding equipment by bolts.

[0026] like Figures 1 to 5 As shown, the top plate 2 is mounted above the base plate 1; the top plate 2 includes a platform plate 2.1 for supporting precision parts and an outer plate 2.2 for mounting the bracket 3; a support column 10 for supporting the platform plate 2.1 is provided between the platform plate 2.1 and the base plate 1, and two second hydraulic cylinders 9 are provided between the outer plate 2.2 and the base plate 1, arranged left and right to support the outer plate 2.2. By controlling the synchronous extension and retraction of the piston rods of the two second hydraulic cylinders 9, the lifting and lowering of the outer plate 2.2 can be controlled. A channel is opened in the center of the outer plate 2.2. 2.4 The platform plate 2.1 is located inside the outer plate 2.2. The support column 10 is a third hydraulic cylinder, which can adjust the height of the platform plate 2.1. The shape of the channel 2.4 is adapted to the shape of the platform plate 2.1, and the platform plate 2.1 can pass through the channel 2.4 in the vertical direction, so that the platform plate 2.1 can not only be higher than the outer plate 2.2, but also lower than the outer plate 2.2, making the adjustable height difference between the platform plate 2.1 and the outer plate 2.2 more extensive, which is suitable for clamping precision parts of different heights and dimensions.

[0027] like Figures 1 to 5 As shown, four brackets 3 are provided, two of which are detachably installed on the left end of the outer plate 2.2, and the other two are detachably installed on the right end of the outer plate 2.2. The two brackets 3 on the left end of the outer plate 2.2 and the two brackets 3 on the right end of the outer plate 2.2 are distributed at intervals along the front-back direction, and the spacing between the front and back brackets 3 is adjustable. A first hydraulic cylinder 4 is installed at the top of each bracket 3. The piston rod of each first hydraulic cylinder 4 extends horizontally along the left-right direction, and a clamping plate 5 is fixedly installed at the outer end of the piston rod of each first hydraulic cylinder 4. The two first hydraulic cylinders 4 on the left and the two first hydraulic cylinders 4 on the right are arranged facing each other, so that the four clamping plates 5 are located between the left and right first hydraulic cylinders 4. The four first hydraulic cylinders 4 can be used to clamp the precision parts placed at the center of the top surface of the top plate 2 from the left and right sides.

[0028] Specifically, such as Figure 1 and Figure 3As shown, the outer plate 2.2 has eight sliding grooves 2.3 for mounting four brackets 3, each sliding groove 2.3 extending in the front-back direction; each bracket 3 has two sliding grooves 2.3 spaced apart on the left and right sides at its bottom end, and the bracket 3 is fastened to the two sliding grooves 2.3 by bolt and nut assemblies, thereby enabling the bracket 3 to be detachably installed on the outer plate 2.2. Each bracket 3 is fixed by two sets of bolt and nut assemblies, ensuring its reliability on the outer plate 2.2; after loosening the two sets of bolt and nut assemblies on the bracket 3, the position of the bracket 3 can be moved in the front-back direction, thereby adjusting the distance between the two front and rear first hydraulic cylinders 4.

[0029] like Figure 1 and Figure 5 As shown, each of the clamping plates 5 is equipped with a pressure sensor 6 on its inner side for measuring the clamping force of the first hydraulic cylinder 4 on the precision part. The measurement data of each pressure sensor 6 can reflect the clamping situation of each first hydraulic cylinder 4 around the precision part in real time. Here, the inner side of the clamping plate 5 is the side that is close to the two clamping plates 5 distributed on the left and right, which is the side that the clamping plate 5 contacts the precision part when clamping it.

[0030] Specifically, pressure sensor 6 is a thin-film pressure sensor, such as the MD30-60 flexible thin-film pressure sensor, or other existing pressure sensors, selected according to requirements.

[0031] As a preferred embodiment, in this example, Figures 1 to 5 As shown, the top left side wall of the two left supports 3 on the outer perimeter plate 2.2 and the top right side wall of the two right supports 3 on the outer perimeter plate 2.2 are both welded or integrally formed with perforated plates 7. The two perforated plates 7 on the two left supports 3 and the two perforated plates 7 on the two right supports 3 are respectively connected by tie rod and nut assemblies 8, which can enhance the reliability of the installation structure between the two left supports 3 on the outer perimeter plate 2.2 and the two right supports 3 on the outer perimeter plate 2.2, and reduce the probability of the supports 3 moving during the clamping process of the first hydraulic cylinder 4.

[0032] In this embodiment, the first hydraulic cylinder 4, the second hydraulic cylinder 9, and the third hydraulic cylinder are all existing technology products. The hydraulic pump, hydraulic valve, hydraulic oil tank, hydraulic oil, high-pressure oil pipe, and other components used with them are all existing conventional technologies. For example, they are also disclosed in the patent with publication number CN222404567U, a hydraulic device for precision machining of parts, which will not be described in detail here.

[0033] In addition, to achieve systematic control, the first hydraulic cylinder 4, the second hydraulic cylinder 9, the third hydraulic cylinder and the pressure sensor 6 are connected to the control system of the existing precision parts grinding equipment to achieve systematic control. This is a conventional technology of existing machine tools, and this application does not involve technical improvements in this part, so it will not be described in detail here.

[0034] The working principle of this embodiment:

[0035] This hydraulic clamp can be installed on the worktable of existing precision parts grinding equipment to clamp and fix precision parts. When clamping and fixing precision parts, the precision parts are placed at the center of the top surface of the platform plate 2.1. According to the length of the precision parts in the front-to-back direction, the distance between the two first hydraulic cylinders 4 at the left end of the outer plate 2.2 and the distance between the two first hydraulic cylinders 4 at the right end of the outer plate 2.2 are adjusted. According to the height of the precision parts, the height of the outer plate 2.2 is adjusted, thereby adjusting the clamping height of the four first hydraulic cylinders 4 on the outer plate 2.2 so that the four first hydraulic cylinders 4 can clamp the precision parts in a suitable position. For grinding precision parts of different sizes and specifications, the height and front-to-back distance of the four first hydraulic cylinders 4 can be adjusted accordingly, so that the four first hydraulic cylinders 4 can cooperate to clamp precision parts with different lengths and heights in the front-to-back direction, thereby increasing the applicability of the hydraulic clamp.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A hydraulic fixture for precision grinding, comprising a base plate (1) and a hydraulic cylinder, characterized in that: A top plate (2) parallel to the substrate (1) is mounted above it. It also includes brackets (3), of which four brackets (3) are provided, two of which are detachably installed on the left end of the top plate (2), and the other two brackets (3) are detachably installed on the right end of the top plate (2). The two brackets (3) on the left end of the top plate (2) and the two brackets (3) on the right end of the top plate (2) are distributed at intervals along the front-back direction, and the distance between the front and back brackets (3) is adjustable. A first hydraulic cylinder (4) is installed at the top of each bracket (3). The piston rod of each first hydraulic cylinder (4) extends horizontally along the left-right direction, and a clamping plate (5) is fixedly installed on the outer end of the piston rod of each first hydraulic cylinder (4). The two first hydraulic cylinders (4) on the left and the two first hydraulic cylinders (4) on the right are arranged facing each other.

2. The hydraulic fixture for precision grinding of parts according to claim 1, characterized in that: The top plate (2) includes a platform plate (2.1) for supporting precision parts and an outer plate (2.2) for mounting brackets (3); a support column (10) for supporting the mounting platform plate (2.1) is provided between the platform plate (2.1) and the base plate (1). The platform plate (2.1) is located inside the outer plate (2.2). A channel (2.4) for the support column (10) to pass through is opened in the center of the outer plate (2.2). All four brackets (3) are mounted on the outer plate (2.2). Multiple second hydraulic cylinders (9) for supporting the mounting outer plate (2.2) are provided between the outer plate (2.2) and the base plate (1).

3. The hydraulic fixture for precision grinding of parts according to claim 1 or 2, characterized in that: Each of the clamping plates (5) is equipped with a pressure sensor (6) on its inner side for measuring the clamping force of the first hydraulic cylinder (4) on the precision part.

4. The hydraulic fixture for precision grinding of parts according to claim 2, characterized in that: The outer plate (2.2) has eight grooves (2.3) for installing four brackets (3), each groove (2.3) extending in the front-back direction; each bracket (3) has two grooves (2.3) spaced apart on the left and right sides at its bottom end, and the bracket (3) and the two grooves (2.3) are fastened together by at least one set of bolt and nut assemblies.

5. The hydraulic fixture for precision grinding of parts according to claim 4, characterized in that: The top left side wall of the two left supports (3) on the outer plate (2.2) and the top right side wall of the two right supports (3) on the outer plate (2.2) are all fixed with perforated plates (7). The two perforated plates (7) on the two left supports (3) and the two perforated plates (7) on the two right supports (3) are respectively connected by a pull screw nut assembly (8).

6. The hydraulic fixture for precision grinding of parts according to claim 2, characterized in that: The support column (10) is the third hydraulic cylinder.

7. The hydraulic fixture for precision grinding of parts according to claim 6, characterized in that: The shape of the channel (2.4) is adapted to the shape of the platform plate (2.1), and the platform plate (2.1) can pass through the channel (2.4) in the vertical direction.

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