A batch fixture for valve stem machining

Abstract

This application discloses a batch fixture for machining valve stems, comprising a base plate, a top plate, and two vertical plates. The top plate can slide up and down along the two vertical plates. Multiple threaded cylinders are mounted on the base plate, and multiple fixing bolts are located on the top plate. Two support units are mounted on the base plate. Two positioning units are located below the top plate, each positioning unit including a strip-shaped mounting base and multiple equally spaced positioning plates mounted on the strip-shaped mounting base. In this fixture, when the top plate moves downward, the positioning plates can position multiple valve stems, ensuring equal spacing between the stems. The valve stems are clamped and fixed by the pressure bar and support bar, making it particularly suitable for batch clamping valve stems with flat ends at equal intervals, thus facilitating the machining of the flat ends of the valve stems by the machine tool. The positions of the support units and the top mounting base are adjustable to accommodate valve stems of different lengths, offering wide applicability.

Description

Technical Field

[0001] This invention relates to the field of fixture technology, and more specifically, to a batch fixture for machining valve stems. Background Technology

[0002] The valve stem is an important component of a valve. It is used for transmission, with the actuator or handle connected to the upper part of the stem. The lower part of the stem directly drives the valve core to move or rotate, thereby realizing the opening and closing or regulation of the valve. During the opening and closing of the valve, the valve stem is not only a moving part and a force-bearing part, but also a sealing part.

[0003] Valve stems come in various shapes. In some valve stems with flat ends, where both ends connect to components such as handwheels, couplings, or valve bodies, machining operations such as drilling are required on the flat ends. During machining, valve stems typically require clamping for fixation. However, existing valve stem clamps often lack stability, resulting in unsatisfactory clamping. In actual machining, the valve stem is prone to shifting, affecting machining accuracy, leading to poor product quality, and producing defective parts requiring rework. This process is cumbersome, time-consuming, labor-intensive, and slow, resulting in low production efficiency and increased costs. This is especially true for batch machining of flat-end valve stems, where ordinary clamps struggle to meet the stability requirements of flat-end machining. Achieving uniformity in the position of multiple valve stems is difficult, leading to inconsistent machining positions and inconsistent overall quality. Furthermore, while some clamping methods provide good clamping, they can only hold one valve stem at a time, further reducing machining efficiency. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a batch fixture for valve stem machining.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a valve stem clamp, comprising a base plate, a top plate, and two vertical plates, wherein the top plate is capable of sliding up and down along the two vertical plates; a plurality of threaded cylinders are installed on the base plate, and a plurality of fixing bolts cooperating with the threaded cylinders are provided on the top plate; two support units are installed on the base plate, and the two support units are capable of supporting a plurality of valve stems placed side by side; two positioning units are provided below the top plate, each positioning unit comprising a strip-shaped mounting base and a plurality of equally spaced positioning plates installed on the strip-shaped mounting base, a plurality of springs connecting the strip-shaped mounting base and the top plate, and both sides of the positioning plates having inclined surfaces capable of abutting against the valve stem, wherein a valve stem can be positioned between two adjacent positioning plates.

[0006] Furthermore, the support unit includes a base, a support vertical plate connected to the base, and a support strip connected to the support vertical plate.

[0007] Thus, multiple valve stems placed side by side can be supported by two support units.

[0008] Furthermore, two top mounting seats are installed at the top plate, and each top mounting seat has a pressing unit below it. The pressing unit includes a lifting plate and a pressing strip connected to the lifting plate via a connecting vertical plate. Multiple screws are connected to the lifting plate, and multiple rotating cylinders are installed at the top mounting seats. The rotating cylinders have internal threads that mate with the screws, and a rotating cylinder bearing is installed between the rotating cylinders and the top mounting seats.

[0009] Thus, the valve stem can be pressed down and fixed by the pressure bar.

[0010] Furthermore, a first gear is installed at the rotating cylinder, and a second gear is installed at the top mounting seat between adjacent first gears of the same top mounting seat. A drive gear and two driven gears meshing with the drive gear are also installed at the top plate. The two driven gears correspond one-to-one with the two top mounting seats, and each driven gear meshes with one of the first gears of the top mounting seat corresponding to the driven gear. The drive gear has a rotating handle that can rotate synchronously with the drive gear.

[0011] The drive gear drives the passive gear, which in turn drives one of the first gears to rotate, thereby driving the pressing unit to press down.

[0012] Furthermore, the base plate has a second slide rail, the base has a second slide groove that mates with the second slide rail, and the base has a first locking bolt capable of locking the positions of the base and the base plate; both sides of the top plate have recessed portions, the recessed portions have limiting insertion holes, the top mounting base has a limiting rod that mates with the limiting insertion holes, and the top of each top mounting base is connected to an end block, the end block has a slot into which the top plate is inserted, and the end block has a second locking bolt that locks the relative positions of the top mounting base and the top plate; The top plate has a third slide rail, on which a slider is installed. The slider has a third locking bolt that locks the slider and the top plate in place. A rotating rod is installed on the slider via a rotating rod bearing. The rotating rod has a regular hexagonal cross-section and a threaded hole. A bottom baffle is fixed to the rotating rod. The driven gear has a regular hexagonal central hole into which the rotating rod is inserted. A fixing knob is installed on the rotating rod. The fixing knob has a knob cap and a rod portion that mates with the threaded hole. The knob cap and the bottom baffle cooperate to clamp and fix the driven gear.

[0013] The installation position of the support unit can be adjusted by the cooperation of the second slide rail and the second slide groove; the relative position of the top mounting base and the top plate can be fixed by the second locking bolt, thereby adjusting the installation position of the top mounting base; and the passive gears of different specifications can be replaced by the cooperation of the third slide rail and the slider.

[0014] Furthermore, both sides of the vertical plate have vertical first slide rails, the top plate has a strip-shaped through hole through which the vertical plate passes, and both ends of the strip-shaped through hole have first slide grooves that cooperate with the first slide rails; the strip-shaped mounting base has a limiting slide groove that cooperates with the first slide rails.

[0015] This allows both the top plate and the strip mounting base to achieve stable lifting and lowering.

[0016] Furthermore, the number of both the threaded cylinder and the fixing bolts is four.

[0017] Furthermore, each strip mounting base has at least five positioning plates.

[0018] This enables batch clamping of valve stems, resulting in high work efficiency.

[0019] Furthermore, both the support strip and the pressure strip have anti-slip strips.

[0020] This prevents the valve stem from shifting during the clamping process.

[0021] Furthermore, the top of the vertical plate has a bar magnet, and the top plate can be attracted and fixed by the bar magnet.

[0022] The top plate can be fixed by the adsorption of the bar magnet.

[0023] Furthermore, the valve stem is a valve stem with flat ends, and each flat end can be clamped between a support bar and a pressure bar.

[0024] This allows the flat end of the valve stem to be clamped and fixed by the support bar and the pressure bar, making it easier to process the flat end.

[0025] Furthermore, a rotating shaft is mounted on the top plate via a rotating shaft bearing, and the drive gear and the rotating handle are both fixed to the rotating shaft.

[0026] Rotating the hand can drive the drive gear to rotate synchronously.

[0027] Furthermore, the passive gear can be replaced with passive gears of different specifications.

[0028] Thus, the driven gear engages with the first gear at the corresponding top mounting seat.

[0029] Beneficial effects:

[0030] 1. The fixture of this application has positioning plates that are evenly spaced. When the top plate moves down, the positioning plates can position multiple valve stems, making the valve stems evenly spaced. The valve stems are clamped and fixed by the pressure bar and the support bar, and the fixing effect is good. Therefore, it is particularly suitable for batch clamping of valve stems with flat ends at equal intervals, which makes it convenient for the machine tool to uniformly process the flat ends of multiple valve stems.

[0031] 2. The positions of the support unit and the top mounting base provided in this application are adjustable, so as to accommodate valve stems of different lengths. Furthermore, different specifications of driven gears can be replaced according to the installation position of the top mounting base, thus making it widely applicable. Attached Figure Description

[0032] Figure 1 A schematic diagram showing the top plate being attracted and fixed by a bar magnet at the top of the vertical plate;

[0033] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0034] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0035] Figure 4 for Figure 1 Another perspective illustration;

[0036] Figure 5 A diagram showing the top plate being lowered so that each valve stem is positioned between two positioning plates;

[0037] Figure 6 A schematic diagram showing how the positioning plate positions each valve stem, ensuring that the valve stems are evenly spaced.

[0038] Figure 7 A schematic diagram illustrating the use of a pressing unit to press down and fix multiple valve stems;

[0039] Figure 8 This is a diagram showing the disassembly of the components.

[0040] Explanation of reference numerals in the attached drawings: 1. Base plate; 1.1 Threaded cylinder; 1.2 Second slide rail; 1.3 Third slide rail; 1.4 Slider; 1.5 Rotating rod; 1.5.1 Bottom baffle; 1.5.2 Knob cap; 1.5.3 Rod part; 2. Top plate; 2.1 Fixing bolt; 2.2 Spring; 2.3 Drive gear; 2.3.1 Rotating handle; 2.4 Passive gear; 3. Vertical plate; 3.1 First slide rail; 3.2 Bar magnet; 4. Support unit; 4.1 Base; 4.2 Supporting vertical plate; 4.3 Support bar; 5.1 Bar mounting seat; 5.2 Positioning plate; 6. Valve stem; 7. Top mounting seat; 7.1 Rotating cylinder; 7.2 First gear; 7.3 Second gear; 7.4 Limiting rod; 7.5 End block; 7.5.1 Slot; 7.5.2 Second locking bolt; 8.1 Lifting plate; 8.2 Connecting vertical plate; 8.3 Lower pressure bar. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] This invention provides, for example Figure 1-8 A batch fixture for machining valve stems is shown, comprising a base plate 1, a top plate 2, and two vertical plates 3. The top plate 2 can slide up and down along the two vertical plates 3. Multiple threaded cylinders 1.1 are installed on the base plate 1, and multiple fixing bolts 2.1 that mate with the threaded cylinders 1.1 are provided on the top plate 2. Two support units 4 are installed on the base plate 1, which can support multiple valve stems 6 placed side by side. Two positioning units are provided below the top plate 2. The positioning unit includes a strip-shaped mounting base 5.1 and multiple positioning plates 5.2 evenly distributed on the strip-shaped mounting base 5.1. Multiple springs 2.2 are connected between the strip-shaped mounting base 5.1 and the top plate 2. Both sides of the positioning plate 5.2 have inclined surfaces that can abut against the valve stem 6, and two adjacent positioning plates 5.2 can position one valve stem 6.

[0044] The support unit 4 includes a base 4.1, a support vertical plate 4.2 connected to the base 4.1, and a support strip 4.3 connected to the support vertical plate 4.2. Two top mounting seats 7 are installed on the top plate 2. Each top mounting seat 7 has a pressing unit below it. The pressing unit includes a lifting plate 8.1 and a pressing strip 8.3 connected to the lifting plate 8.1 via the connecting vertical plate 8.2. Multiple screws are connected to the lifting plate 8.1. Multiple rotating cylinders 7.1 are installed on the top mounting seats 7. Each rotating cylinder 7.1 has an internal thread that mates with the screws. A rotating mechanism is installed between the rotating cylinder 7.1 and the top mounting seat 7. The rotating cylinder 7.1 is equipped with a first gear 7.2, and a second gear 7.3 is installed on the top mounting seat 7 between adjacent first gears 7.2. The top plate 2 is also equipped with a drive gear 2.3 and two driven gears 2.4 that mesh with the drive gear 2.3. The two driven gears 2.4 correspond one-to-one with the two top mounting seats 7, and each driven gear 2.4 meshes with one of the first gears 7.2 of the top mounting seat 7 corresponding to that driven gear 2.4. The drive gear 2.3 is equipped with a rotating handle 2.3.1 that can rotate synchronously with the drive gear 2.3.

[0045] The base plate 1 has a second slide rail 1.2, the base 4.1 has a second slide groove that mates with the second slide rail 1.2, and the base 4.1 has a first locking bolt that locks the positions of the base 4.1 and the base plate 1. The top plate 2 has recessed portions on both sides, each recessed portion having a limiting insertion hole. The top mounting seat 7 has a limiting rod 7.4 that mates with the limiting insertion hole. Each top mounting seat 7 has an end block 7.5 connected to its top end. The end block 7.5 has a slot 7.5.1 into which the top plate 2 is inserted, and the end block 7.5 has a second locking bolt 7.5.2 that locks the relative positions of the top mounting seat 7 and the top plate 2. The top plate 2 has a third slide rail 1.2. The slide rail 1.3 has a slider 1.4 installed thereon. The slider 1.4 has a third locking bolt that locks the slider 1.4 and the top plate 2. The slider 1.4 has a rotating rod 1.5 installed thereon via a rotating rod bearing. The rotating rod 1.5 has a regular hexagonal cross-section and a threaded hole. The rotating rod has a bottom baffle 1.5.1 fixed thereon. The driven gear 2.4 has a regular hexagonal center hole into which the rotating rod is inserted. The rotating rod has a fixing knob installed thereon. The fixing knob has a knob cap 1.5.2 and a rod part 1.5.3 that mates with the threaded hole. The knob cap 1.5.2 and the bottom baffle 1.5.1 work together to clamp and fix the driven gear 2.4.

[0046] The vertical plate 3 has vertical first slide rails 3.1 on both sides. The top plate 2 has a strip-shaped through hole through which the vertical plate 3 passes. Both ends of the strip-shaped through hole have first slide grooves that mate with the first slide rails 3.1. The strip-shaped mounting base 5.1 has a limiting slide groove that mates with the first slide rails 3.1. There are four threaded cylinders 1.1 and four fixing bolts 2.1. There are five or more strip-shaped mounting bases 5.1. The support strip 4.3 and the lower pressure strip 8.3 both have anti-slip strips. The top of the vertical plate 3 has a strip magnet 3.2, and the top plate 2 can be attracted and fixed by the strip magnet 3.2.

[0047] Working Principle: The fixture of this application features evenly spaced positioning plates. When the top plate moves downward, the positioning plates can position multiple valve stems, ensuring their even distribution. The valve stems are then clamped and fixed by the pressure bars and support bars, providing excellent fixation. This makes it particularly suitable for batch clamping of valve stems with flat ends at equal intervals, facilitating the machine tool's uniform processing of the flat ends of multiple valve stems. For example, after processing one flat end, the drill bit can move to process the next flat end; most existing drilling machines have this function. Furthermore, the positions of the support unit and the top mounting base are adjustable to accommodate valve stems of different lengths. Different specifications of driven gears can be replaced depending on the installation position of the top mounting base, resulting in wide applicability.

[0048] The specific workflow is as follows:

[0049] First, adjust the support unit and top mounting base to the appropriate positions according to the actual valve stem specifications, and replace the appropriate driven gear according to the installation position of the top mounting base.

[0050] Then as Figure 1-4 As shown, the top plate is attracted and fixed by a bar magnet at the top of the vertical plate, and multiple valve stems are placed side by side between the two support units, thereby supporting the multiple valve stems through the two support units.

[0051] Then as Figure 5 As shown, the top plate moves downwards with the cooperation of the first slide rail and the first slide groove, so that each valve stem is positioned between two adjacent positioning plates, and then as... Figure 6 As shown, the top plate continues to descend. Due to the evenly spaced distribution of the positioning plates, the positioning plates can position multiple valve stems as the top plate moves downward, resulting in an evenly spaced distribution of valve stems. Then, the top plate is fixed using fixing bolts. At this time, the valve stems are positioned by the contact of adjacent positioning plates.

[0052] Then as Figure 7As shown, rotating the rotary handle drives the driven gear, which in turn drives the lower pressure bar to descend and press down and fix multiple valve stems. At this time, the flat end of each valve stem can be clamped between a support bar and a lower pressure bar, thus facilitating the machine tool to uniformly process and drill holes at both ends of multiple valve stems.

[0053] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A batch fixture for machining valve stems, characterized in that, The device includes a base plate, a top plate, and two vertical plates. The top plate can slide up and down along the two vertical plates. Multiple threaded cylinders are mounted on the base plate, and multiple fixing bolts mate with the threaded cylinders are located on the top plate. Two support units are mounted on the base plate, capable of supporting multiple valve stems placed side-by-side. Below the top plate are two positioning units, each including a strip-shaped mounting base and multiple equally spaced positioning plates mounted on the mounting base. Multiple springs connect the strip-shaped mounting base and the top plate. Each positioning plate has inclined surfaces on both sides capable of abutting against a valve stem, and adjacent positioning plates can position one valve stem. The support unit includes a base, a supporting vertical plate connected to the base, and a supporting strip connected to the supporting vertical plate. The top plate... Two top mounting seats are installed, each with a pressing unit underneath. The pressing unit includes a lifting plate and a pressing bar connected to the lifting plate via a connecting vertical plate. Multiple screws are connected to the lifting plate, and multiple rotating cylinders are installed at the top mounting seats. The rotating cylinders have internal threads that mate with the screws, and rotating cylinder bearings are installed between the rotating cylinders and the top mounting seats. A first gear is installed at the rotating cylinder, and a second gear is installed at the top mounting seat between adjacent first gears of the same top mounting seat. A drive gear and two driven gears that mesh with the drive gear are also installed at the top plate. The two driven gears correspond one-to-one with the two top mounting seats, and each driven gear meshes with one of the first gears of the top mounting seat corresponding to that driven gear. The drive gear has a rotating grip that can rotate synchronously with the drive gear; The base plate has a second slide rail, and the base has a second slide groove that mates with the second slide rail. The base also has a first locking bolt that locks the base and the base plate in place. Both sides of the top plate have recessed portions with limiting holes. The top mounting base has a limiting rod that mates with the limiting holes. Each top mounting base has an end block connected to its top end. Each end block has a slot into which the top plate is inserted, and the end block has a second locking bolt that locks the top mounting base and the top plate in place. The top plate has a third slide rail, and a slider is mounted on the third slide rail. The slider has a third locking bolt that locks the slider and the top plate in place. A rotating rod is mounted on the slider via a rotating rod bearing. The rotating rod has a regular hexagonal cross-section and a threaded hole. A bottom baffle is fixed to the rotating rod. The driven gear has a regular hexagonal central hole into which the rotating rod is inserted. A fixing knob is mounted on the rotating rod. The fixing knob has a knob cap and a rod portion that mates with the threaded hole. The knob cap and the bottom baffle cooperate to clamp and fix the driven gear. The valve stem is a valve stem with flat ends. Each flat end can be clamped between a support bar and a pressure bar.

2. The batch fixture for valve stem machining according to claim 1, characterized in that, Both sides of the vertical plate have vertical first slide rails, the top plate has a strip-shaped through hole through which the vertical plate passes, and both ends of the strip-shaped through hole have first slide grooves that cooperate with the first slide rails; the strip-shaped mounting base has a limiting slide groove that cooperates with the first slide rails.

3. The batch fixture for valve stem machining according to claim 1, characterized in that, The number of threaded cylinders and fixing bolts is 4 each.

4. The batch fixture for valve stem machining according to claim 1, characterized in that, Each strip mounting base has at least 5 positioning plates.

5. The batch fixture for valve stem machining according to claim 3, characterized in that, Both the support strip and the lower pressure strip have anti-slip strips.

6. The batch fixture for valve stem machining according to claim 2, characterized in that, The top of the vertical plate has a bar magnet, and the top plate can be attracted and fixed by the bar magnet.

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