A positioning fixture for machining hydraulic valve body blanks

Abstract

This invention provides a positioning fixture for machining hydraulic valve body blanks, including a base block, a connecting plate, a first pressure seat, a second pressure seat, a floating positioning pin, and clamping components. The base block has a clamping space. The connecting plate extends movably through the opposite ends of the base block. The first pressure seat connects to one end of the connecting plate, and the second pressure seat connects to the other end of the connecting plate. The symmetry line of the second pressure seat coincides with the symmetry line of the base block. Both the first and second pressure seats are connected to the base block via spring contact. The floating positioning pin is mounted on the first pressure seat and extends through one end of the base block into the clamping space. The floating positioning pin has elasticity after being stretched. The clamping components are respectively mounted on the first and second pressure seats at the centerline positions of the corresponding base blocks and extend into the clamping space. This invention avoids insufficient groove allowance inside valve holes located far from the positioning surface and significantly reduces machining defects.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic valve processing technology, specifically to a positioning fixture for hydraulic valve body processing blanks. Background Technology

[0002] A hydraulic valve is an automated component operated by pressurized oil. It is controlled by the pressurized oil in a regulating valve and is typically used in combination with a solenoid regulating valve for remote control of the on / off states of oil, gas, and water pipelines in hydropower stations. It is commonly used in clamping, control, and lubrication circuits. Structurally, a hydraulic valve includes a valve core, valve body, and operating device. When machining valve body blanks, clamping fixtures are typically used to position and fix them on the machine tool. Clamping fixtures are devices used during machining to fix the workpiece in the correct position for processing or inspection. Currently, clamping fixtures for valve body blanks typically use lever cylinders to clamp and fix the blanks on the machine tool's worktable. However, this method has been found to have the following defects: In the first process, the valve hole is positioned axially at the end. Due to significant dimensional errors in the valve body blank, insufficient allowance occurs in the internal groove of the valve hole at positions far from the positioning surface, ultimately increasing the likelihood of workpiece scrap. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems mentioned above by providing a positioning fixture for machining a hydraulic valve body blank, which can avoid the situation of insufficient groove allowance in the valve hole at a position far from the positioning surface and greatly reduce machining defects.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A positioning fixture for a hydraulic valve body machining blank includes a base block, a connecting plate, a first pressure seat, a second pressure seat, a floating positioning pin, and a clamping component. The base block is fixedly mounted on a worktable and has a clamping space for holding the valve body machining blank. The connecting plate extends movably through opposite ends of the base block. The first pressure seat is connected to one end of the connecting plate and is located on the side of the base block opposite to the clamping space, extending in a direction perpendicular to the connecting plate. The second pressure seat is connected to the other end of the connecting plate. The second pressure seat is located at the other end of the base block, away from the clamping space, and extends in a direction perpendicular to the connecting plate. The symmetry line of the second pressure seat coincides with the symmetry line of the base block. The first pressure seat and the second pressure seat are both connected to the base block by spring contact. The floating positioning pin is installed on the first pressure seat and extends through one end of the base block to the clamping space. The floating positioning pin has elasticity after being stretched. The clamping members are respectively installed on the first pressure seat and the second pressure seat at the center line position corresponding to the base block and extend to the clamping space.

[0006] Furthermore, the base block includes two end seats and a middle seat, the middle seat is located in the middle of the two end seats, and the two ends of the connecting plate movably pass through the two end seats; the first pressure seat and the second pressure seat are connected to the corresponding end seats by springs; the middle seat is provided with side positioning pins, which are disposed through the connecting plate.

[0007] Furthermore, the end seat includes a fixing plate and a mounting plate. The fixing plate is used to fix the end seat on the workbench. The mounting plate is perpendicularly connected to the fixing plate and extends away from the fixing plate. A through hole is provided on the mounting plate, and an adapter groove is recessed through the through hole. The end of the connecting plate passes through the through hole. The first pressure seat and the second pressure seat are located in the adapter grooves of the corresponding mounting plates and are fixedly connected to the connecting plate.

[0008] Furthermore, the clamping component includes a tapered pin and a first clamping screw. The tapered pin is movably mounted on the base block and extends into the clamping space. The first clamping screw is inserted into the corresponding pressure seat, and the other end of the first clamping screw hooks the tapered pin.

[0009] Furthermore, a second clamping screw is provided through one side of the base block corresponding to the first pressure seat, and a third clamping screw is provided through the opposite sides of the base block corresponding to the second pressure seat.

[0010] Furthermore, the floating positioning pin includes a floating spring, a prismatic cone pin, and a limiting pin. One end of the floating spring is fixedly connected to the first pressure seat and extends into the corresponding end of the base block. The prismatic cone pin is movably inserted into the corresponding end of the base block and one end of the prismatic cone pin is connected to the floating spring. The other end of the prismatic cone pin extends into the clamping space. The limiting pin is inserted into the side of the base block and, together with the limiting pin, can limit the prismatic cone pin to the base block.

[0011] Furthermore, it also includes an anti-misalignment rod, which is disposed on one side of the connecting plate and extends in a direction perpendicular to the connecting plate.

[0012] Furthermore, it also includes a thrust screw, which is respectively installed on the first pressure seat and the second pressure seat, and the base block is provided with a pressure hole corresponding to the thrust screw.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects:

[0014] When using the aforementioned hydraulic valve body machining blank positioning fixture, the first pressure seat is pushed away from the second pressure seat, and the spring connected to the first pressure seat is stretched. The first pressure seat drives the corresponding floating positioning pin and the corresponding clamping member to move away from the second pressure seat, increasing the distance between the first and second pressure seats. The valve body machining blank is placed in the clamping space, and the valve hole of the valve body machining blank corresponding to the floating positioning pin and the clamping member is aligned with the floating positioning pin and the clamping member. The thrust on the first pressure seat is released, and the spring connected to the first pressure seat is reset. At this time, the clamping member and the floating positioning pin on the first pressure seat are inserted into the valve hole corresponding to the valve body machining blank, and the floating positioning pin generates a thrust on the valve body machining blank. The grip on the valve body machining blank is released, and the floating positioning pin continues to push the valve body machining blank towards the second pressure seat. At this time, the clamping member on the second pressure seat is inserted into the valve hole of the valve body machining blank away from the first pressure seat. After the clamping member is clamped, the valve body machining blank is confined on the base block.

[0015] As can be seen, since the first and second pressure seats are all connected to the base block by springs and the floating positioning pin has elasticity after compression, the width of the clamping space can be automatically and adaptively adjusted according to the actual size of the valve body blank after initial positioning by the floating positioning pin and the clamping member. This avoids insufficient groove allowance inside the valve hole at a position far from the positioning surface. In addition, since the clamping member is installed at the centerline position of the corresponding base block of the first and second pressure seats, when the clamping member is clamped, it can hold the middle blank groove of the valve hole of the valve body blank and accurately center and position the valve hole axially. After centering and positioning the valve hole axially, the machining allowance of the valve hole axial groove will be more uniform, greatly reducing machining defects. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of the positioning fixture for holding the hydraulic valve body machining blank.

[0017] Figure 2 A schematic diagram of the positioning fixture for machining the blank of a hydraulic valve body.

[0018] Figure 3 for Figure 2 A partial diagram of the explosion.

[0019] Figure 4 for Figure 2 A bottom view.

[0020] Figure 5 for Figure 2 Top view.

[0021] Figure 6 for Figure 5 A sectional view along line AA.

[0022] Figure 7 for Figure 5 Sectional view along line BB.

[0023] In the attached diagram, 1-base block, 11-end seat, 111-fixing plate, 112-mounting plate, 113-through hole, 114-adapter groove, 115-through groove, 12-middle seat, 121-side positioning pin, 13-clamping space, 2-connecting plate, 21-anti-misalignment rod, 3-first pressure seat, 4-second pressure seat, 5-floating positioning pin, 51-floating spring, 52-prism tapered pin, 53-limiting pin, 6-clamping component, 61-tapered pin, 62-first clamping screw, 7-spring, 8-second clamping screw, 9-third clamping screw, 10-thrust screw, 100-valve body machining blank. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] like Figures 1 to 7 As shown, a preferred embodiment of this utility model provides a positioning fixture for a hydraulic valve body machining blank, including a base block 1, a connecting plate 2, a first pressure seat 3, a second pressure seat 4, a floating positioning pin 5, and a clamping member 6. The base block 1 is fixedly installed on a workbench, and a clamping space 13 for clamping the valve body machining blank 100 is provided on the base block 1. The two ends of the connecting plate 2 movably pass through the two ends of the base block 1. The first pressure seat 3 is connected to one end of the connecting plate 2, and the first pressure seat 3 is located on the side of one end of the base block 1 away from the clamping space 13 and extends in a direction perpendicular to the connecting plate 2. The second pressure seat 4... 4. The other end of the connecting plate 2 is connected. The second pressure seat 4 is located on the other end of the base block 1, away from the clamping space 13 and extending in the direction perpendicular to the connecting plate 2. The symmetry line of the second pressure seat 4 coincides with the symmetry line of the base block 1. The first pressure seat 3 and the second pressure seat 4 are connected to the base block 1 by springs 7. The floating positioning pin 5 is installed on the first pressure seat 3 and extends through one end of the base block 1 to the clamping space 13. The floating positioning pin 5 has elasticity after being stretched. The clamping members 6 are respectively installed on the first pressure seat 3 and the second pressure seat 4 at the center line position of the corresponding base block 1 and extend through the base block 1 to the clamping space 13.

[0028] When using the aforementioned hydraulic valve body machining blank positioning fixture, the first pressure seat 3 is pushed away from the second pressure seat 4, stretching the spring 7 connected to the first pressure seat 3. The first pressure seat 3 then moves the corresponding floating positioning pin 5 and the corresponding clamping member 6 away from the second pressure seat 4, increasing the distance between the first pressure seat 3 and the second pressure seat 4. The valve body machining blank 100 is then placed into the clamping space 13, aligning the valve hole of the valve body machining blank 100 with the floating positioning pin 5 and the clamping member 6, releasing the thrust on the first pressure seat 3. When the spring 7 connected to the first pressure seat 3 is reset, the clamping member 6 and the floating positioning pin 5 on the first pressure seat 3 are inserted into the valve hole corresponding to the valve body machining blank 100, and the floating positioning pin 5 exerts a pushing force on the valve body machining blank 100, releasing the grip on the valve body machining blank 100. The floating positioning pin 5 continues to push the valve body machining blank 100 toward the second pressure seat 4. At this time, the clamping member 6 on the second pressure seat 4 is inserted into the valve body machining blank 100 away from the valve hole of the first pressure seat 3. After the clamping member 6 is pressed, the valve body machining blank 100 is limited to the base block 1.

[0029] As can be seen, since the first pressure seat 3 and the second pressure seat 4 are all connected to the base block 1 by the spring 7 and the floating positioning pin 5 has elasticity after compression, the width of the clamping space 13 can be automatically adjusted according to the actual size of the valve body machining blank 100 after initial positioning by the floating positioning pin 5 and the clamping member 6. This avoids the situation where the groove allowance inside the valve hole is insufficient in the position far from the positioning surface. In addition, since the clamping member 6 is respectively installed at the center line position of the first pressure seat 3 and the second pressure seat 4 corresponding to the base block 1, when the clamping member 6 is clamped, it can hold the middle blank groove of the valve hole of the valve body machining blank 100 and accurately center and position the valve hole axially. After centering and positioning the valve hole axially, the machining allowance of the valve hole axial groove will be more uniform, greatly reducing machining defects.

[0030] In this embodiment, the base block 1 includes two end seats 11 and a middle seat 12. The middle seat 12 is located in the middle of the two end seats 11, and the two ends of the connecting plate 2 movably pass through the two end seats 11. The first pressure seat 3 and the second pressure seat 4 are connected to the corresponding end seats 11 by springs 7. Specifically, the end seat 11 includes a fixing plate 111 and a mounting plate 112. The fixing plate 111 is used to fix it on the workbench, and the mounting plate 112 is perpendicularly connected to the fixing plate 111 and extends perpendicularly away from the fixing plate 111. The space between the two mounting plates 112 is the clamping space 13. A through hole 113 is provided on the mounting plate 112, and an adapter groove 114 is recessed through the through hole 113. Detailed, corresponding to... The adapter groove 114 of the first pressure seat 3 is located on one side of the corresponding mounting plate 112, and the adapter groove 114 of the second pressure seat 4 is located in the middle of the corresponding mounting plate 112; the end of the connecting plate 2 has a through hole 113; the first pressure seat 3 and the second pressure seat 4 are located in the adapter groove 114 of the corresponding mounting plate 112 and are fixedly connected to the connecting plate 2. Specifically, one end of the spring 7 is fixedly connected to the interior of the corresponding mounting plate 112, and the other end of the spring 7 extends to the adapter groove 114 and contacts the first pressure seat 3 or the second pressure seat 4.

[0031] The central base 12 is provided with a side positioning pin 121, which passes through the connecting plate 2. The central base 12 is provided with a screw hole for fixing and mounting on the worktable. The side positioning pin 121 is used to insert and position the valve hole on the side of the valve body blank 100.

[0032] In this embodiment, the clamping member 6 includes a tapered pin 61 and a first clamping screw 62. The tapered pin 61 is movably mounted on the mounting plate 112 of the base block 1 and extends into the clamping space 13. The first clamping screw 62 is inserted into the first pressure seat 3 or the second pressure seat 4, and the other end of the first clamping screw 62 hooks the tapered pin 61. When the first clamping screw 62 on the first pressure seat 3 and the second pressure seat 4 is pressed towards the clamping space 13, the first clamping screw 62 pushes the corresponding tapered pin 61 into the valve hole corresponding to the valve body machining blank 100, which can realize the limiting and axial coarse positioning of the valve body machining blank 100.

[0033] In this embodiment, the floating positioning pin 5 includes a floating spring 51, a prismatic tapered pin 52, and a limiting pin 53. One end of the floating spring 51 is fixedly connected to the first pressure seat 3 and extends into the corresponding end of the base block 1. Specifically, a through groove 115 is provided on the corresponding mounting plate 112, which connects to the clamping space 13, and the floating spring 51 extends into the through groove 115. The prismatic tapered pin 52 is movably inserted into the corresponding end of the base block 1, and one end of the prismatic tapered pin 52 is connected to the floating spring 51. The other end of the prismatic tapered pin 52 extends into the clamping space 13. Specifically, one end of the prismatic tapered pin 52 is located in the through groove 115 and connected to the floating spring 51, and the other end of the prismatic tapered pin 52 extends into the clamping space 13. The limiting pin 53 is inserted into the side of the base block 1 and can limit the prismatic pin 52 on the base block 1. Specifically, the corresponding mounting plate 112 has a slot from the side to the through groove 115. The limiting pin 53 is inserted into the through groove 115 from the slot and contacts the inner wall of the groove on the side wall of the prismatic pin 52.

[0034] When the valve body blank 100 is placed in the clamping space 13 and the valve hole of the valve body blank 100 corresponding to the floating positioning pin 5 and the clamping member 6 is aligned with the floating positioning pin 5 and the clamping member 6, the prismatic tapered pin 52 and the hook tapered pin 61 are aligned with the corresponding valve hole. When the first pressure seat 3 is pushed away from the second pressure seat 4, the first pressure seat 3 drives the floating spring 51 to move away from the second pressure seat 4, the prismatic tapered pin 52 is limited by the limiting pin 53, and the floating spring 51 is stretched to generate elastic force. When the pushing force on the first pressure seat 3 is released and the valve body machining blank 100 is gripped, the elastic force of the spring 7 pulls the first pressure seat 3 toward the second pressure seat 4, and the prismatic pin 52 is inserted into the corresponding valve hole and abuts against the valve body machining blank 100. When the gripping of the valve body machining blank 100 is released, the elastic force of the floating spring 51 pushes the valve body machining blank 100 toward the second pressure seat 4 through the prismatic pin 52, and further clamps the valve body machining blank 100. At this time, the valve body machining blank 100 is automatically adjusted for adaptive clamping.

[0035] In this embodiment, a second clamping screw 8 is provided through one side of the base block 1 corresponding to the first pressure seat 3, and a third clamping screw 9 is provided through the opposite sides of the base block 1 corresponding to the second pressure seat 4. After the first clamping screw 62 is clamped, the second clamping screw 8 and the third clamping screw 9 are clamped toward the valve body machining blank 100, which can further position and limit the valve body machining blank 100.

[0036] In this embodiment, the hydraulic valve body machining blank positioning fixture also includes an anti-misalignment rod 21. The anti-misalignment rod 21 is located on one side of the connecting plate 2 and extends in a direction perpendicular to the connecting plate 2. The anti-misalignment rod 21 is on the same side as the mounting plate 112. When the valve body machining blank 100 is placed into the clamping space 13, the side of the valve body machining blank 100 contacts the anti-misalignment rod 21. The anti-misalignment rod 21 ensures that the middle blank groove of the valve body machining blank 100 corresponds to the clamping member 6 when the blank is placed.

[0037] In this embodiment, the hydraulic valve body machining blank positioning fixture also includes a thrust screw 10, which is respectively mounted on the first pressure seat 3 and the second pressure seat 4, and the mounting plate 112 of the base block 1 is provided with a pressure hole corresponding to the thrust screw 10. When the thrust screw 10 is pushed into the corresponding pressure hole, the first pressure seat 3 and the second pressure seat 4 can be locked to the corresponding mounting plate 112.

[0038] This embodiment also provides a positioning and clamping method for a hydraulic valve body machining blank, which is used to clamp the valve body machining blank 100, and specifically includes the following steps:

[0039] Equipment provided: Provide the aforementioned hydraulic valve body machining blank positioning fixture;

[0040] Equipment installation: Fix the base block 1 on the workbench, that is, fix the fixing plate 111 on the workbench;

[0041] First pressure seat 3 avoids: Push the first pressure seat 3 in a direction away from the second pressure seat 4;

[0042] Place the valve body machining blank 100: Place the valve body machining blank 100 into the clamping space 13 and make the valve hole of the valve body machining blank 100 corresponding to the floating positioning pin 5 and the clamping member 6 correspond to the floating positioning pin 5 and the clamping member 6, so that the side of the valve body machining blank 100 contacts the anti-misalignment rod 21.

[0043] Coarse positioning: Release the thrust on the first pressure seat 3 and release the grip on the valve body machining blank 100;

[0044] Precise positioning: Press the clamping component 6, specifically, press the first clamping screw 62 on the first pressure seat 3 and the second pressure seat 4 toward the clamping space 13.

[0045] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A hydraulic valve body machining blank positioning fixture, characterized by: The system includes a base block (1), a connecting plate (2), a first pressure seat (3), a second pressure seat (4), a floating positioning pin (5), and a clamping component (6). The base block (1) is used to be fixedly installed on the workbench, and a clamping space (13) is provided on the base block (1) for clamping a valve body machining blank (100). The two ends of the connecting plate (2) movably pass through the two ends of the base block (1). The first pressure seat (3) is connected to one end of the connecting plate (2) and is located on the side of the base block (1) away from the clamping space (13) and extends in a direction perpendicular to the connecting plate (2). The second pressure seat (4) is connected to the other end of the connecting plate (2). The second pressure seat (4) is located on the other side of the base block (1) away from the clamping space (13) and extends in a direction perpendicular to the connecting plate (2). The symmetry line of the second pressure seat (4) coincides with the symmetry line of the base block (1). The first pressure seat (3) and the second pressure seat (4) are both connected to the base block (1) by springs (7). The floating positioning pin (5) is installed on the first pressure seat (3) and extends through one end of the base block (1) to the clamping space (13). The floating positioning pin (5) has elasticity after being stretched. The clamping member (6) is installed on the first pressure seat (3) and the second pressure seat (4) respectively at the center line position of the base block (1) and extends to the clamping space (13).

2. The hydraulic valve body machining blank positioning fixture as described in claim 1, characterized in that: The base block (1) includes two end seats (11) and a middle seat (12). The middle seat (12) is located in the middle of the two end seats (11). The two ends of the connecting plate (2) movably pass through the two end seats (11). The first pressure seat (3) and the second pressure seat (4) are connected to the corresponding end seats (11) by springs (7). The middle seat (12) is provided with side positioning pins (121), which pass through the connecting plate (2).

3. A hydraulic valve body machining blank positioning fixture as claimed in claim 2, wherein: The end seat (11) includes a fixing plate (111) and a mounting plate (112). The fixing plate (111) is used to fix it on the workbench. The mounting plate (112) is perpendicularly connected to the fixing plate (111) and extends away from the fixing plate (111). A through hole (113) is provided on the mounting plate (112), and an adapter groove (114) is recessed through the through hole (113). The end of the connecting plate (2) passes through the through hole (113). The first pressure seat (3) and the second pressure seat (4) are located in the adapter groove (114) of the corresponding mounting plate (112) and are fixedly connected to the connecting plate (2).

4. A hydraulic valve body machining blank positioning fixture as claimed in claim 1, wherein: The clamping member (6) includes a tapered pin (61) and a first clamping screw (62). The tapered pin (61) is movably mounted on the base block (1) and extends into the clamping space (13). The first clamping screw (62) is inserted into the corresponding pressure seat, and the other end of the first clamping screw (62) hooks the tapered pin (61).

5. A hydraulic valve body machining blank positioning fixture as claimed in claim 1 wherein: The base block (1) is provided with a second clamping screw (8) through one side corresponding to the first pressure seat (3), and the base block (1) is provided with a third clamping screw (9) through the opposite sides corresponding to the second pressure seat (4).

6. A hydraulic valve body machining blank positioning fixture as claimed in claim 1 wherein: The floating positioning pin (5) includes a floating spring (51), a prismatic pin (52), and a limiting pin (53). One end of the floating spring (51) is fixedly connected to the first pressure seat (3) and the floating spring (51) extends into the corresponding end of the base block (1). The prismatic pin (52) is movably inserted into the corresponding end of the base block (1) and one end of the prismatic pin (52) is connected to the floating spring (51). The other end of the prismatic pin (52) extends into the clamping space (13). The limiting pin (53) is inserted into the side of the base block (1) and the limiting pin (53) can limit the prismatic pin (52) to the base block (1).

7. A hydraulic valve body machining blank positioning fixture as claimed in claim 1 wherein: It also includes a fault-prevention rod (21), which is located on one side of the connecting plate (2) and extends in a direction perpendicular to the connecting plate (2).

8. A hydraulic valve body machining blank positioning fixture as claimed in claim 1 wherein: It also includes a thrust screw (10), which is respectively installed on the first pressure seat (3) and the second pressure seat (4), and the base block (1) is provided with a pressure hole corresponding to the thrust screw (10).

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