Clamp suitable for hydraulic valve body machining

Abstract

The utility model discloses a clamp suitable for hydraulic valve body machining. The clamp comprises a clamp bottom plate, a plurality of clamp limiting blocks, a top pressing structure and a plurality of side pressing structures. The whole clamp bottom plate is of a convex structure and is fixed to a machine tool workbench, and a middle boss of the clamp bottom plate is used for supporting a hydraulic valve body. The multiple clamp limiting blocks are distributed on any two adjacent side faces of the middle boss and then fixed to the step face of the clamp bottom plate, and the clamp limiting blocks are used for limiting movement of the hydraulic valve body in the two horizontal directions. The top pressing structure acts on the top surface of the hydraulic valve body and is used for pressing the hydraulic valve body on the middle boss; a plurality of side pressing structures are distributed on the rest two adjacent side faces of the middle boss and then are fixed on the side faces of the middle boss, and the side pressing structures are used for limiting the rest two horizontal movement of the hydraulic valve body. The novel clamp provided by the utility model has better applicability to machining of various multi-way valves, and meanwhile, has better flexibility degree.

Description

Technical Field

[0001] The utility model relates to a fixture applicable to machining of a hydraulic valve body, belonging to the technical field of valve body fixtures. Background Art

[0002] The hydraulic multi-way valve is the core control component of the hydraulic system of construction machinery. The valve body is the core component, and currently, a casting structure is mostly adopted. Among them, for the casting valve body with a spool valve structure, the machining quality of the spool hole, cartridge valve hole, etc. directly affects the working performance and service life of the hydraulic multi-way valve, while the machining cost directly affects the competitiveness of the product in the market. At present, many foreign manufacturers have realized the mass production of casting valve bodies with high efficiency and low cost, and are developing towards the direction of high efficiency, high integration, intelligence, and flexibility.

[0003] The traditional four-sided square box type machining fixture is a special fixture customized for a specific valve body and is a welding structure with extremely poor versatility. In order to reduce the cost of the valve body machining fixture and improve the machining efficiency, the flexible fixture design technology is adopted to design a machining flexible fixture for the working joint valve body of the high-end multi-way valve of the excavator.

[0004] The existing patent discloses a fixture for a multi-station combined machine tool, with the publication number of CN204524937U. This technology has the following deficiencies:

[0005] 1. The fixture for the multi-station combined machine tool mentioned in the patent uses a hydraulic system as the driving part, with high manufacturing cost and high failure rate;

[0006] 2. The fixture for the multi-station combined machine tool described in the patent is only applicable to workpieces with simple structures and is not applicable to the machining of complex valve bodies, which is not conducive to market promotion. Summary of the Invention

[0007] In view of the deficiencies of the existing technology, the utility model provides a fixture applicable to machining of a hydraulic valve body. This new fixture has good applicability to the machining of various multi-way valves and also has a good degree of flexibility.

[0008] The utility model is implemented according to the following technical solutions:

[0009] A fixture applicable to machining of a hydraulic valve body, comprising:

[0010] A fixture base plate, which is of a convex structure as a whole and is fixed on the machine tool workbench. The middle convex platform of the fixture base plate is used to support the hydraulic valve body;

[0011] A plurality of fixture limit blocks, which are distributed on any two adjacent sides of the middle convex platform and then fixed on the step surface of the fixture base plate, and are used for limiting the movement of the hydraulic valve body in two horizontal directions;

[0012] A top pressing structure acts on the top surface of the hydraulic valve body to press the hydraulic valve body against the middle boss.

[0013] A plurality of side pressing structures are distributed on the remaining two adjacent sides of the middle boss and fixed on the side surfaces of the middle boss to limit the remaining two horizontal movements of the hydraulic valve body.

[0014] In some embodiments, the top pressing structure includes:

[0015] Two fixture columns are respectively fixed at the diagonals of the fixture bottom plate, and their heights are higher than the top surface of the hydraulic valve body.

[0016] A fixture cross beam spans across the two fixture columns and is fixed at the tops of the two fixture columns.

[0017] A pressing component is installed in the middle of the fixture cross beam to apply a vertically downward pressure to the hydraulic valve body, thereby fixing the hydraulic valve body on the middle boss.

[0018] In some embodiments, the bottom of the fixture column is provided with an external thread, and the stepped surface of the fixture bottom plate is provided with a threaded hole. The fixture column is fixed on the fixture bottom plate by a bolt connection method; each end of the fixture cross beam is provided with a through hole, and the top of the fixture column is provided with a stepped structure, and an external thread is provided on the radial outer peripheral surface of the stepped structure; the fixture column is inserted into the through hole of the fixture cross beam, and the fixture cross beam is limited at the step of the fixture column, and the fixture cross beam is fixed on the fixture column by tightening a compression nut.

[0019] In some embodiments, the pressing component includes:

[0020] A pressing screw is inserted into the threaded hole in the middle of the fixture cross beam. After the two are threadedly engaged, the pressing screw is rotated to convert the circumferential movement of the pressing screw into an axial movement and gradually approach the hydraulic valve body downward.

[0021] A pressing disc is installed at the bottom of the pressing screw and is used to contact the top surface of the hydraulic valve body to press the hydraulic valve body downward.

[0022] In some embodiments, the middle of the pressing disc is provided with a threaded hole, and the bottom of the pressing screw is provided with an external thread and a circle of bosses above the external thread; the pressing screw is screwed into the threaded hole of the pressing disc until the bosses abut against the opening end face of the threaded hole. In the case of thread slipping between the pressing screw and the pressing disc, the hydraulic valve body can be continuously pressed downward by the bosses pressing against the pressing disc.

[0023] In some embodiments, the fixture limit block is composed of a fixed disk at the bottom and a limit post fixed thereon; the fixed disk is fixed on the stepped surface of the fixture bottom plate through a plurality of bolts, and the limit post is set as a flat vertical surface at the fitting parts with the side surface of the hydraulic valve body and the side surface of the middle boss.

[0024] In some embodiments, the side pressing structure includes:

[0025] A pressing plate, the lower part of which is fixed on the side surface of the middle boss through bolts, and the upper part of the pressing plate protrudes from the middle boss and is used to limit the hydraulic valve body;

[0026] A stop block, which is fixed on the side surface of the middle boss close to the pressing plate and is used to limit the stop block in the vertical position.

[0027] In some embodiments, at least one anti-misalignment block is fixed at the edge of the middle boss close to the fixture limit block, and the anti-misalignment block can extend into the groove on one side surface of the hydraulic valve body to prevent the hydraulic valve body from being installed in reverse on the middle boss.

[0028] In some embodiments, a plurality of lifting eye bolts for lifting the fixture are provided on the stepped surface of the fixture bottom plate.

[0029] In some embodiments, a plurality of through holes are provided on the fixture bottom plate for being fixed on the machine tool workbench in cooperation with bolts.

[0030] Advantages of the present utility model:

[0031] 1. The fixture column has good rigidity: The fixture column is directly thread-connected to the fixture bottom plate without excessive connection, with a simple structure and good openness.

[0032] 2. Restrict the movement of the fixture crossbeam: The compression nut sinks into the fixture crossbeam by 2 mm - 5 mm, thereby restricting the possible movement at the connection part.

[0033] 3. The fixture is firmly pressed: The connection between the upper pressing disc and the pressing screw adopts a combination of two methods: threaded connection and boss limit, which is more reliable.

[0034] 4. The fixture adds an anti-misalignment function: The fixture adds an anti-misalignment block to achieve the anti-misalignment function, and clamping cannot be performed after the hydraulic valve body is installed in reverse.

[0035] 5. The fixture is convenient for clamping: The hydraulic valve body is clamped by a manual fixture, the tooling design is simple, the tooling cost is reduced, and at the same time, the clamping is convenient and rapid, the positioning is accurate, and the processing efficiency is high. Description of the Drawings

[0036] The accompanying drawings, as part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0037] In the accompanying drawings:

[0038] Figure 1 is a three-dimensional view of the fixture of the present utility model;

[0039] Figure 2 is a side view of the fixture of the present utility model Figure 1 ;

[0040] Figure 3 is a side view of the fixture of the present utility model Figure 2 ;

[0041] Figure 4 is a side view of the fixture of the present utility model Figure 3 ;

[0042] Figure 5 is a side view of the fixture of the present utility model Figure 4 ;

[0043] Figure 6 is a top view of the fixture of the present utility model.

[0044] Reference signs in the drawings: machine tool workbench 1, fixture bottom plate 2, fixture limit block 3, fixture column 4, compression nut 5, fixture cross beam 6, compression screw 7, compression disc 8, anti-misalignment block 9, side compression structure 10, lifting eye screw 11, hydraulic valve body 12.

[0045] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0047] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0048] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "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 a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 As shown in

[0050] The following further describes the above-mentioned top pressing structure.

[0051] Continue to refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6As shown in the figure, the top pressing structure includes two fixture columns 4, a fixture crossbeam 6 and a pressing component; the two fixture columns 4 are respectively fixed at the diagonals of the fixture bottom plate 2, and their heights are higher than the top surface of the hydraulic valve body 12; the fixture crossbeam 6 spans across the two fixture columns 4 and is fixed at the tops of the two fixture columns 4; the pressing component is installed in the middle of the fixture crossbeam 6 and is used to apply a vertically downward pressure to the hydraulic valve body 12, thereby fixing the hydraulic valve body 12 on the middle boss.

[0052] For a further solution, continue to refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown in the figure, the bottom of the fixture column 4 is provided with an external thread, and the stepped surface of the fixture bottom 2 plate is provided with a threaded hole. The fixture column 4 is fixed on the fixture bottom plate 2 by a bolt connection method, without excessive connection, and has a simple structure and good openness; each end of the fixture crossbeam 6 is provided with a through hole, and the top of the fixture column 4 is set as a stepped structure, and an external thread is provided on the radial outer peripheral surface of the stepped structure; the fixture column 4 passes through the through hole of the fixture crossbeam 6, and the fixture crossbeam 6 is limited at the step of the fixture column 4, and the fixture crossbeam 6 is fixed on the fixture column 4 by tightening with a compression nut 5.

[0053] It should be noted that the compression nut 5 sinks into the fixture crossbeam 6 by 3 mm, thereby restricting possible movement at the connection part.

[0054] The above pressing component is further described below.

[0055] Continue to refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown in the figure, the pressing component includes a pressing screw 7 and a pressing disc 8; the pressing screw 7 passes through the threaded hole in the middle of the fixture crossbeam 6, and after the two are threadedly engaged, the pressing screw 7 is rotated, and the circumferential movement of the pressing screw 7 is converted into an axial movement and gradually approaches the hydraulic valve body 12 downward; the pressing disc 8 is installed at the bottom of the pressing screw 7 and is used to contact the top surface of the hydraulic valve body 12, thereby pressing the hydraulic valve body 12 downward.

[0056] For a further solution, continue to refer to Figure 2 As shown in the figure, the middle of the pressing disc 8 is provided with a threaded hole, and the bottom of the pressing screw 7 is provided with an external thread and a circle of bosses above the external thread; the pressing screw 7 is screwed into the threaded hole of the pressing disc 8 until the bosses abut against the opening end face of the threaded hole. In the case of thread slipping between the pressing screw 7 and the pressing disc 8, the pressing disc 8 can continue to be tightly pressed downward against the hydraulic valve body 12 through the bosses.

[0057] The following further explains the above-mentioned fixture limit block.

[0058] Continuing to refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 As shown, the fixture limit block 3 consists of a fixed disk at the bottom and a limit post fixed thereon; the fixed disk is fixed on the stepped surface of the fixture bottom plate 2 by a plurality of bolts, and the limit post is set as a flat vertical surface at the fitting part with the side surface of the hydraulic valve body 12 and the side surface of the middle boss.

[0059] The following further explains the above-mentioned side pressing structure.

[0060] Continuing to refer to Figure 4 、 Figure 5 As shown, the side pressing structure 10 includes a pressing plate and a stop block; the lower part of the pressing plate is fixed on the side surface of the middle boss by bolts, and the upper part of the pressing plate protrudes from the middle boss and is used to limit the hydraulic valve body 12; the stop block is fixed on the side surface of the middle boss close to the pressing plate and is used to limit the stop block in the vertical position.

[0061] For a further solution, continuing to refer to Figure 1 、 Figure 3 As shown, at least one anti-misalignment block 9 is fixed at the edge of the middle boss close to the fixture limit block 3, and the anti-misalignment block 9 can extend into the groove on one side surface of the hydraulic valve body 12 to prevent the hydraulic valve body 12 from being installed reversely on the middle boss.

[0062] For a further solution, continuing to refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 As shown, a plurality of lifting eye bolts 10 for lifting the fixture are provided on the stepped surface of the fixture bottom plate 2.

[0063] For a further solution, a plurality of through holes are provided on the fixture bottom plate 2 for being fixed on the machine tool workbench 1 in cooperation with bolts.

[0064] In summary, the present utility model provides a fixture applicable to the machining of hydraulic valve bodies. The fixture base plate is connected to the machine tool workbench by M16 bolts; the fixture column is directly thread-connected to the fixture base plate without excessive connection, with a simple structure and good openness; the compression nut is recessed into the fixture cross beam by 3 mm, thereby restricting possible movement at the connection part; the upper compression disc and the compression screw are connected by a combination of thread connection and boss limit, which is more reliable. The hydraulic valve body is placed on the fixture base plate, and multi-point positioning is achieved through the fixture limit blocks. After clamping, it is clamped through the compression screw, compression disc, and lateral compression structure. At the same time, the fixture is equipped with an anti-misalignment block to achieve the anti-misalignment function, and clamping cannot be performed when the hydraulic valve body is installed in reverse. During the machining process, four surfaces of the hydraulic valve body can be machined, and there is sufficient machining space to meet the distribution of machining content, minimizing the machining interference generated by the fixture. The hydraulic valve body is pressed by a manual fixture, with a simple tooling design, reducing the tooling cost. At the same time, the clamping is convenient and rapid, the positioning is accurate, and the machining efficiency is high. This new fixture has good applicability to the machining of various multi-way valves, and at the same time has a good degree of flexibility, which has certain reference significance for peer enterprises in the hydraulic valve manufacturing industry.

[0065] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present utility model can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0066] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features contained in other embodiments rather than other features, the combination of the features of different embodiments also means that it is within the protection scope of the present utility model and forms different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0067] The above description is only a preferred embodiment of the present utility model and does not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present utility model, can make some changes or modifications using the technical content prompted above as equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the present utility model.

Claims

1. A fixture applicable to the machining of hydraulic valve bodies, characterized in that, Including: A fixture base plate, which is of a convex structure as a whole and is fixed on the machine tool workbench. The middle boss of the fixture base plate is used to support the hydraulic valve body; A plurality of fixture limit blocks, which are distributed on any two adjacent sides of the middle boss and then fixed on the step surface of the fixture base plate, and are used to limit the movement of the hydraulic valve body in two horizontal directions; A top pressing structure, which acts on the top surface of the hydraulic valve body and is used to press the hydraulic valve body against the middle boss; A plurality of side pressing structures, which are distributed on the remaining two adjacent sides of the middle boss and then fixed on the side surface of the middle boss, and are used to limit the movement of the hydraulic valve body in the remaining two horizontal directions.

2. The fixture for machining of a hydraulic valve body according to claim 1, wherein The top pressing structure includes: Two fixture columns, which are respectively fixed at the diagonals of the fixture base plate, and their heights are higher than the top surface of the hydraulic valve body; A fixture cross beam, which spans across the two fixture columns and is fixed on the tops of the two fixture columns; A pressing component, which is installed in the middle of the fixture cross beam and is used to apply a vertically downward pressure to the hydraulic valve body, so as to fix the hydraulic valve body on the middle boss.

3. The fixture for machining of hydraulic valve body according to claim 2, wherein: The bottom of the fixture column is provided with an external thread, and the step surface of the fixture base plate is provided with a threaded hole. The fixture column is fixed on the fixture base plate by means of bolt connection; Each end of the fixture cross beam is provided with a through hole, and the top of the fixture column is provided with a stepped structure, and an external thread is provided on the outer peripheral surface of the stepped structure; The fixture column is inserted into the through hole of the fixture cross beam, and the fixture cross beam is limited at the step of the fixture column, and the fixture cross beam is fixed on the fixture column by tightening a compression nut.

4. A fixture applicable to machining of a hydraulic valve body according to claim 2, characterized in that, The pressing component includes: A pressing screw, which is inserted into the threaded hole in the middle of the fixture cross beam. After the two are in threaded cooperation, the pressing screw is rotated, and the circumferential movement of the pressing screw is converted into axial movement and then gradually approaches the hydraulic valve body downward; A pressing disc, which is installed at the bottom of the pressing screw and is used to contact the top surface of the hydraulic valve body, so as to press the hydraulic valve body downward.

5. The fixture for machining of hydraulic valve body according to claim 4, wherein: The middle of the pressing disc is provided with a threaded hole, and the bottom of the pressing screw is provided with an external thread and a circle of convex platform above the external thread; The pressing screw is screwed into the threaded hole of the pressing disc until the convex platform abuts against the opening end face of the threaded hole. In the case of thread slipping between the pressing screw and the pressing disc, the convex platform can continue to press the pressing disc downward to press the hydraulic valve body.

6. The fixture for machining of hydraulic valve body according to claim 1, wherein: The fixture limit block is composed of a fixed disc at the bottom and a limit post fixed thereon; The fixed disc is fixed on the step surface of the fixture base plate by a plurality of bolts, and the limit post is set as a flat vertical surface at the fitting part with the side surface of the hydraulic valve body and the side surface of the middle boss.

7. A fixture applicable to the machining of a hydraulic valve body according to claim 1, characterized in that, The side pressing structure includes: A pressing plate, the lower part of which is fixed on the side surface of the middle boss by bolts, and the upper part of the pressing plate protrudes from the middle boss and is used to limit the hydraulic valve body. The stopper is fixed on the side of the middle boss after closely abuting against the pressing plate, and is used to limit the position of the stopper in the vertical direction.

8. The fixture applicable to the machining of hydraulic valve bodies according to claim 1, wherein: At least one anti-misalignment block is fixed at the edge of the middle boss close to the fixture stopper. The anti-misalignment block can extend into the groove on one side of the hydraulic valve body to prevent the hydraulic valve body from being installed in the wrong direction on the middle boss.

9. The fixture applicable to the machining of hydraulic valve bodies according to claim 1, wherein: A plurality of lifting eye bolts for lifting the fixture are provided on the stepped surface of the fixture bottom plate.

10. A fixture applicable to the machining of a hydraulic valve body according to claim 1, characterized in that: A plurality of through holes are provided on the fixture bottom plate and are used to be fixed on the machine tool workbench in cooperation with bolts.

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