CN115193687B - Screening device for valve fitting machining - Google Patents

Abstract

The invention relates to the technical field of valve production, in particular to a screening device for processing valve fittings, including a base, a sleeve, a screening cylinder and a clamping mechanism. The sleeve is rotatably arranged on the base; The cylinder is rotatably arranged on the sleeve, and the screening cylinder is provided with a connecting channel for discharging the grinding material attached to the workpiece, and the connecting channel is connected to the screening cylinder and the external environment; the clamping mechanism is rotatably arranged on the screening cylinder , the clamping mechanism has a first working position and a second working position. The second working position is higher than the first working position on the screening cylinder. When it is in the first working position, the clamping mechanism is used to clamp the workpiece. When the workpiece is in the second position, the clamping mechanism is used to release the workpiece; by setting the sleeve, the screening cylinder and the clamping mechanism, the workpiece is clamped and released at a fixed point, and under the joint movement of the sleeve and the screening cylinder, the workpiece The grinding material attached to the surface is screened out, which is convenient for the subsequent processing of the workpiece.

Description

A screening device for processing valve fittings

technical field

The invention relates to the technical field of valve production, in particular to a screening device for processing valve fittings.

Background technique

The valve is a control component in the fluid delivery system, which has functions such as cut-off, adjustment, flow diversion, reverse flow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves used in fluid control systems range from the simplest cut-off valves to various valves used in extremely complex automatic control systems, with a wide variety of varieties and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. There are various types of industrial valves, which are widely used in chemical industry, food, water, electricity and other industries, and mainly play the role of flow regulation and cut-off of fluid medium.

For example, Chinese patent CN207385927U discloses a vibrating screening device for butterfly valve body processing. The device includes vibrating screening equipment, a support frame and a plurality of material conveying equipment. On the outer side of the material input end on the side, the support frame includes a support frame body and a rotating shaft support seat, and two rotating shaft support seats are arranged symmetrically at intervals along the longitudinal direction on the top of the support frame body, and a rotating shaft can be placed on the rotating shaft support seat; The above-mentioned material conveying equipment is detachably arranged below the discharge end of the vibrating screening equipment.

In order to ensure the tightness of the valve, the precision of the valve fittings has high requirements, and the shapes of the valve fittings are different, and the vibration grinding method is used for processing to make it meet the use requirements. After vibrating and grinding, the polished material is easy to get stuck in the gap of the valve fittings and needs to be removed manually, which is cumbersome, labor-intensive, and low-efficiency.

Contents of the invention

Based on this, it is necessary to provide a method for processing valve fittings in view of the problems that the current grinding materials are easy to get stuck in the gaps of valve fittings, need to be manually removed, the work is cumbersome, labor-intensive, and work efficiency is low. Screening device.

Above-mentioned purpose realizes through following technical scheme:

A screening device for processing valve fittings, comprising:

base;

a sleeve rotatably arranged on the base;

A screening cylinder is rotatably arranged on the sleeve, and the screening cylinder is provided with a connecting channel for discharging the grinding material attached to the workpiece, and the connecting channel is connected to the screening cylinder and the external environment;

The clamping mechanism is rotatably arranged on the screening cylinder, the clamping mechanism has a first working position and a second working position, and the position of the second working position on the screening cylinder is higher than the The first working position, when in the first working position, the clamping mechanism is used to clamp the workpiece, and in the second working position, the clamping mechanism is used to release the workpiece.

In one of the embodiments, the clamping mechanism includes a first clamping plate, a second clamping plate, an elastic member, a first transmission member, a second transmission member and a third transmission member, and the first clamping plate and the second clamping plate can be rotatably arranged on the screening cylinder, one end of the elastic member is fixed on the first clamping plate, and the other end is fixed on the second clamping plate, and the elastic member always drives the first The angle between a splint and the second splint becomes larger; the first transmission element is fixedly arranged on the first splint, the second transmission element is fixed on the second splint, and the The third transmission member is fixedly arranged on the screening cylinder, the movement of the first transmission member drives the movement of the third transmission member, and the movement of the third transmission member drives the movement of the second transmission member.

In one of the embodiments, a guide is fixedly arranged on the first splint, a first guide passage and a second guide passage are arranged on the sleeve, and when the guide moves along the first guide passage, , the angle between the first splint and the second splint remains unchanged; when the guide moves along the second guide channel, the guide drives the first splint relative to the The screening cylinder moves, the movement of the first splint drives the movement of the second splint, and the angle between the first splint and the second splint becomes smaller.

In one of the embodiments, the sectional plane of the inner circumference of the screening cylinder along the axial direction of the screening cylinder is hexagonal.

In one of the embodiments, a discharge member is further included, the discharge member is fixedly arranged on the sleeve, and the workpiece released by the clamping mechanism enters into the discharge member.

In one of the embodiments, a blocking member is provided on the discharging member, and the blocking member is used to prevent the grinding material from entering the discharging member.

In one of the embodiments, a collector is further included, and the collector is used to collect the workpieces discharged by the discharge member.

In one embodiment, it further includes a first driving member and a second driving member, the first driving member is used to drive the sleeve to move; the second driving member is used to drive the screening cylinder to move.

The beneficial effects of the present invention are:

The invention specifically relates to a screening device for processing valve fittings, including a base, a sleeve, a screening cylinder and a clamping mechanism. The sleeve is rotatably arranged on the base; the screening cylinder is rotatably arranged on the On the sleeve, the screening cylinder is provided with a connecting channel for discharging the grinding material attached to the workpiece, and the connecting channel communicates with the screening cylinder and the external environment; the clamping mechanism is rotatably arranged on the screening cylinder, and the clamping mechanism has a second One working position and the second working position, the second working position is higher than the first working position on the screening cylinder, when it is in the first working position, the clamping mechanism is used to clamp the workpiece, when it is in the second workpiece position, The clamping mechanism is used to release the workpiece; by setting the sleeve, the screening cylinder and the clamping mechanism, the workpiece is clamped and released at a fixed point, and under the joint movement of the sleeve and the screening cylinder, the abrasive material attached to the workpiece is After sieving, it is convenient for the subsequent processing of the workpiece.

Description of drawings

Fig. 1 is a schematic structural view of a screening device and a grinding device for processing valve fittings provided by an embodiment of the present invention;

Fig. 2 is a schematic structural view of a screening device for processing valve fittings provided by an embodiment of the present invention;

Fig. 3 is a schematic structural view of a screening device for processing valve fittings without a support frame provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of a local enlarged structure at A of the screening device for processing valve accessories described in Fig. 3 ;

Fig. 5 is a side sectional structural schematic diagram of a screening mechanism of a screening device used for processing valve fittings provided by an embodiment of the present invention;

Fig. 6 is a schematic diagram of a partially enlarged structure at B of the screening mechanism of the screening device for processing valve fittings described in Fig. 5;

Fig. 7 is a schematic structural view of the screening mechanism of the screening device for processing valve fittings provided by an embodiment of the present invention, with the sleeve and connecting ring removed;

Fig. 8 is a schematic diagram of a partially enlarged structure at C of the screening mechanism of the screening device for processing valve fittings described in Fig. 7 with the sleeve and connecting ring removed;

Fig. 9 is a front view sectional structural schematic diagram of a screening mechanism of a screening device used for processing valve fittings provided by an embodiment of the present invention;

Fig. 10 is a schematic structural view of the screening mechanism with the sleeve removed for the screening device used for processing valve fittings provided by an embodiment of the present invention;

FIG. 11 is a schematic diagram of a partial enlarged structure at D of the screening mechanism without the sleeve of the screening device for processing valve fittings described in FIG. 10 .

in:

100. Vibration grinder;

200, the first screening assembly; 210, the support frame; 220, the sleeve; 221, the first transmission shaft; 222, the guide groove; 230, the second transmission shaft; 240, the inlet; 250, the fixed rod; 260, The first connecting plate; 261, the discharge port; 270, the feed pipe; 280, the second connecting plate;

300, the second screening assembly; 310, the first splint; 311, the retaining rod; 312, the first transmission plate; 320, the screening cylinder; 321, the connecting ring; 322, the support plate; 323, the connecting rod; 330, the gear 340, discharge cylinder; 341, connecting column; 342, baffle plate; 350, second splint; 351, second transmission plate; 360, support ring.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail through the following embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The serial numbers assigned to the components in this document, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. The "connection" and "connection" mentioned in this application include direct and indirect connection (connection) unless otherwise specified. In describing the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description , rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

As shown in Figures 1-11, a screening device for processing valve fittings provided by an embodiment of the present invention includes a support frame 210, a sleeve 220, a screening cylinder 320 and a clamping mechanism. The sleeve 220 passes through the first The drive shaft 221 is rotatably connected to the support frame 210, the first connecting plate 260 and the second connecting plate 280 are fixedly connected to the sleeve 220; the screening cylinder 320 is rotatably connected to the sleeve 220, and the screening cylinder 320 is provided with a connecting ring 321, a supporting plate 322 and a connecting rod 323, one end of the connecting ring 321 is rotatably connected to the sleeve 220, and the other end is fixedly connected with the supporting plate 322, the connecting ring 321 is provided with a connecting groove, the second The transmission shaft 230 is rotatably connected to the first connecting plate 260, the support ring 360 is fixedly sleeved on the second transmission shaft 230, one end of the support ring 360 is fixedly connected to the support plate 322, and one end of the screening cylinder 320 is rotatably connected to the On the first connecting plate 260, the other end is rotatably connected to the second connecting plate 280, and the peripheral wall surface on the screening cylinder 320 is a sieve hole structure, and the grinding material falls into the support frame 210 through the sieve hole, which is convenient for reuse; The clamping mechanism is rotatably connected to the screening cylinder 320. The clamping mechanism has a first working position: the opening of the feed pipe 270 on the second connecting plate 280, a second working position: above the discharge cylinder 340, When in the first working position, the clamping mechanism is used for clamping the valve accessories, and when in the second working position, the clamping mechanism is used for releasing the valve accessories.

By setting the sleeve 220, the screening cylinder 320 and the clamping mechanism, the valve fittings are clamped and released at fixed points, and under the joint movement of the sleeve 220 and the screening cylinder 320, the abrasive materials attached to the valve fittings are screened Down, to facilitate the follow-up processing of valve fittings.

As shown in Fig. 5, Fig. 6, Fig. 7, and Fig. 8, in some embodiments, the clamping mechanism includes a first clamping plate 310, a second clamping plate 350, a scroll spring, a fixed rod 250 and a gear 330, and the first clamping plate 310 and the second clamping plate 350 can be rotatably sleeved on the connecting rod 323, and a scroll torsion spring is arranged between the first clamping plate 310 and the second clamping plate 350, and the scroll torsion spring makes the connection between the first clamping plate 310 and the second clamping plate 350 The angle between becomes larger; the first clamping plate 310 is provided with a first transmission plate 312, the second clamping plate 350 is provided with a second transmission plate 351, and the first transmission plate 312 and the second transmission plate 351 are all arranged in the connecting groove, Both the first transmission plate 312 and the second transmission plate 351 are provided with ring racks; the fixed rod 250 is fixedly sleeved on the connecting rod 323, the gear 330 is rotatably connected to the fixed rod 250, and one end of the gear 330 is connected to the first transmission The ring gear on the plate 312 is engaged, and the other end is engaged with the ring gear on the second transmission plate 351 .

As shown in Fig. 3 and Fig. 4, in some embodiments, the first splint 310 is provided with a stop rod 311, and the sleeve 220 is provided with a guide groove 222, the guide groove 222 starts above the discharge cylinder 340 and ends at the top of the discharge cylinder 340. At the opening of the feed pipe 270 on the second connecting plate 280; the guide groove 222 is set so that when the blocking rod 311 moves in the guide groove 222, the scroll torsion spring makes the first clamping plate 310 and the second clamping plate 350 open, When the blocking rod 311 reaches the opening of the feed pipe 270 on the second connecting plate 280, the blocking rod 311 abuts against the inside of the sleeve 220, so that the first splint 310 rotates, and the rotation of the first splint 310 drives the second splint 350 to reverse. Rotating to make the angle between the first clamping plate 310 and the second clamping plate 350 become smaller, thereby clamping the valve fitting.

As shown in FIG. 5 , in some embodiments, the sectional plane of the inner circumference of the screening cylinder 320 along the direction of its own axis is hexagonal.

It can be understood that, except that the sectional plane of the inner circumference of the screening cylinder 320 along the direction of its own axis is hexagonal, the sectional plane of the inner circumference of the screening cylinder 320 along the direction of its own axis may also be a pentagon, Polygons such as heptagons and octagons.

As shown in Figure 3, Figure 5, and Figure 10, in some embodiments, one end of the discharge cylinder 340 is rotatably connected to the support ring 360, and the other end is fixedly connected to the second connecting plate 280 through the connecting column 341, and the stop rod 311 reaches When above the discharge cylinder 340, the scroll torsion spring makes the first splint 310 and the second splint 350 open, so that the valve fittings are put into the discharge cylinder 340, and with the swing of the sleeve 220, the valve fittings are released from the discharge Port 261 discharges.

It can be understood that if the grinding material attached to the valve fittings is not vibrated cleanly within one cycle, the valve fittings can be re-screened by putting the valve fittings into the screening cylinder 320 again, and the discharge cylinder 340 can also be removed, so that a batch of After the valve accessories enter the screening cylinder 320 through the feed pipe 270, as the screening cylinder 320 rotates around the axis of the first transmission shaft 221 on the one hand, and rotates around the axis of the second transmission shaft 230 on the other hand, the first splint The grinding material on the valve fitting between 310 and the second splint 350 is shaken off and falls into the screening cylinder 320. Since the screening cylinder 320 has a sieve hole structure, the grinding material falls into the support frame 210 through the sieve hole , for reuse. The valve fittings that are not clamped by the first clamping plate 310 and the second clamping plate 350 in the screening cylinder 320 will be removed after the next set of first clamping plates 310 and second clamping plates 350 come along with the rotation of the second transmission shaft 230 Clamp, and then shake and sieve the grinding material; after multiple times of clamping and releasing, the grinding material on the valve fitting is fully shaken off, at this time, the first motor and the second motor are turned off, and the valve fitting is moved from The screening cylinder 320 is taken out to facilitate subsequent processing.

As shown in Figure 5, in some embodiments, a baffle 342 is provided on the discharge cylinder 340, and the baffle 342 prevents the grinding material on the valve fitting from falling into the discharge cylinder 340, and prevents grinding while avoiding waste of resources. The material again falls on the valve fitting.

In some embodiments, a collection basket is also included, and the collection basket is arranged under the discharge port 261 to facilitate collection of the valve fittings discharged from the discharge cylinder 340 .

In some embodiments, the first motor is fixedly connected to the support frame 210, and the first motor drives the sleeve 220 to rotate along the axial direction of the first transmission shaft 221; the second motor is fixedly connected to the first connecting plate 260, and the second The second motor drives the second transmission shaft 230 to rotate along its own axis, and then drives the screening cylinder 320 to rotate; while the screening cylinder 320 rotates around the axis of the first transmission shaft 221 , The rotation, on the one hand, makes it easier to shake out the grinding material in the valve fittings, and on the other hand, makes the valve fittings evenly distributed in the axial direction of the screening cylinder 320, making the screening more efficient.

In combination with the above-mentioned embodiments, the usage principle and working process of the embodiments of the present invention are as follows:

The screening device for processing valve fittings includes a vibration mill 100 and a screening mechanism, and the screening mechanism includes a first screening assembly 200 and a second screening assembly 300 .

In order to ensure the accuracy of the valve fittings, it is necessary to use a vibrating grinder 100 to grind the surface of the valve fittings so that the valve fittings meet the requirements for use. pink).

The first screening assembly 200 includes a support frame 210, a sleeve 220, a second transmission shaft 230, a feed inlet 240, a fixed rod 250, a first connecting plate 260, a feeding pipe 270 and a second connecting plate 280, which are ground by vibration The valve fittings polished by the machine 100 enter the screening mechanism through the feed port 240; the sleeve 220 is rotatably connected to the support frame 210 through the first transmission shaft 221, the first motor is fixedly connected to the support frame 210, and the second A motor drives the sleeve 220 to rotate along the axial direction of the first transmission shaft 221; the second transmission shaft 230 is rotatably connected to the first connecting plate 260, the second motor is fixedly connected to the first connecting plate 260, and the second The motor drives the second transmission shaft 230 to rotate along its own axis; the first connecting plate 260 and the second connecting plate 280 are fixedly connected to the sleeve 220; The connecting plate 280 communicates with and is arranged on the lower right part of the second connecting plate 280 , and the valve fitting enters into the screening cylinder 320 through the feed pipe 270 .

The second screening assembly 300 includes a first clamping plate 310, a screening cylinder 320, a gear 330, a discharge cylinder 340, a second clamping plate 350 and a supporting ring 360, and the screening cylinder 320 is provided with a connecting ring 321, a supporting plate 322 and a connecting ring 320. Rod 323, one end of the connecting ring 321 is rotatably connected to the sleeve 220, the other end is fixedly connected to the support plate 322, the connecting ring 321 is provided with a connecting groove, and one end of the screening cylinder 320 is rotatably connected to the first connecting plate 260 The other end is rotatably connected to the second connecting plate 280; the support ring 360 is fixedly sleeved on the second transmission shaft 230, one end of the support ring 360 is fixedly connected to the support plate 322, and the second motor drives the second transmission shaft 230 Rotation, the rotation of the second transmission shaft 230 drives the screening cylinder 320 to rotate; the first splint 310 and the second splint 350 can be rotatably sleeved on the connecting rod 323, and there is a Scroll torsion spring, the scroll torsion spring makes the angle between the first splint 310 and the second splint 350 larger, the first splint 310 is provided with a stop bar 311 and the first transmission plate 312, and the second splint 350 is provided with There is a second transmission plate 351, the first transmission plate 312 and the second transmission plate 351 are all arranged in the connecting groove, the first transmission plate 312 and the second transmission plate 351 are all provided with ring racks; the fixed rod 250 is fixedly socketed On the connecting rod 323, the gear 330 is rotatably connected to the fixed rod 250, one end of the gear 330 is engaged with the ring rack on the first transmission plate 312, and the other end is engaged with the ring rack on the second transmission plate 351; A connecting post 341 and a baffle 342 are arranged on the barrel 340 , one end of the discharging barrel 340 is rotatably connected to the supporting ring 360 , and the other end is fixedly connected to the second connecting plate 280 through the connecting post 341 .

The valve fittings polished by the vibration grinder 100 enter the screening mechanism through the feed port 240, the feed pipe 270 is arranged at the lower right part of the second connecting plate 280 and the inside of the screening cylinder 320 is a hexagonal structure, which is convenient for the second A clamping plate 310 and a second clamping plate 350 clamp the valve fitting. The first motor drives the sleeve 220 to rotate along the axial direction of the first transmission shaft 221 and the second motor drives the screening cylinder 320 to rotate along the axial direction of the second transmission shaft 230, so that the valve workpiece is held by the first splint 310 and the second After being clamped by the second splint 350, it is convenient to shake off the grinding material (grinding powder) in the valve fitting.

The guide groove 222 starts at the top of the discharge cylinder 340 and ends at the opening of the feed pipe 270 on the second connecting plate 280; so that when the stop rod 311 moves in the guide groove 222, the scroll torsion spring makes the first splint 310 and the second clamping plate 350 are opened, and when the blocking rod 311 reaches the opening of the feed pipe 270 on the second connecting plate 280, the blocking rod 311 abuts against the inside of the sleeve 220, so that the first clamping plate 310 rotates, and the first clamping plate The rotation of 310 drives the second splint 350 to rotate in reverse so that the angle between the first splint 310 and the second splint 350 becomes smaller, thereby clamping the valve fitting; The spring makes the first clamping plate 310 and the second clamping plate 350 open, so that the valve fittings are put into the discharge barrel 340 , and the valve fittings are discharged from the discharge port 261 as the sleeve 220 swings.

In the preparation stage, the valve fittings polished by the vibrating grinder 100 enter the screening mechanism through the feed port 240 , and then enter the screening cylinder 320 from the feed pipe 270 .

In the screening stage, the first motor drives the sleeve 220 to rotate along the axis of the first transmission shaft 221 , and the second motor drives the screening cylinder 320 to rotate (the sleeve 220 rotates reciprocally, and the screening cylinder 320 rotates clockwise). The valve accessories are concentrated at the bottom of the screening cylinder 320 under the action of gravity. When the stop rod 311 reaches the opening of the feed pipe 270 on the second connecting plate 280, the stop rod 311 abuts against the inside of the sleeve 220, so that the first clamping plate 310 rotation, the rotation of the first splint 310 drives the second splint 350 to rotate in the opposite direction so that the angle between the first splint 310 and the second splint 350 becomes smaller, thereby clamping the valve accessories, (the first splint 310 and the second splint 350 is a screen structure with certain elasticity), and during the reciprocating rotation of the sleeve 220, the valve accessories can be better distributed between the first splint 310 and the second splint 350 in the axial direction of the sleeve 220, in Ensure the clamping force and reasonably distribute the position of the valve fittings.

As the screening cylinder 320 rotates around the axis of the first transmission shaft 221 on the one hand, and on the other hand around the axis of the second transmission shaft 230, the grinding on the valve fittings between the first clamping plate 310 and the second clamping plate 350 The material is shaken off and falls into the screening cylinder 320. Since the screening cylinder 320 has a sieve hole structure, the grinding material falls into the support frame 210 through the sieve holes, which is convenient for reuse. The valve fittings that are not clamped by the first clamping plate 310 and the second clamping plate 350 in the screening cylinder 320 will be removed after the next set of first clamping plates 310 and second clamping plates 350 come along with the rotation of the second transmission shaft 230 Clamped, then shaken and sieved to remove abrasive material.

When the blocking rod 311 reaches the top of the discharge cylinder 340, the blocking rod 311 is in the guide groove 222 at this time, and the first clamping plate 310 and the second clamping plate 350 are opened under the action of the scroll torsion spring, thereby releasing the valve accessories , so that the valve fittings fall into the discharge barrel 340 , and with the swing of the sleeve 220 , the valve fittings are discharged from the discharge port 261 .

The interior of the screening cylinder 320 is a hexagonal structure, which makes it easier for the valve fittings to be concentrated at the intersection of the hexagons and to be clamped more easily; while the screening cylinder 320 rotates around the axis of the first transmission shaft 221, it Rotating along the axis of the second transmission shaft 230, on the one hand, makes the grinding material in the valve fittings shake out more easily, and on the other hand, makes the valve fittings evenly distributed in the axial direction of the screening cylinder 320, and the screening is more efficient.

The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (6)

1. A screening device for processing valve fittings, characterized in that it comprises: base; a sleeve rotatably arranged on the base; A screening cylinder is rotatably arranged on the sleeve, and the screening cylinder is provided with a connecting channel for discharging the grinding material attached to the workpiece, and the connecting channel is connected to the screening cylinder and the external environment; The clamping mechanism is rotatably arranged on the screening cylinder, the clamping mechanism has a first working position and a second working position, and the position of the second working position on the screening cylinder is higher than the The first working position, when in the first working position, the clamping mechanism is used to clamp the workpiece, and in the second working position, the clamping mechanism is used to release the workpiece, so The clamping mechanism includes a first clamping plate, a second clamping plate, an elastic member, a first transmission member, a second transmission member and a third transmission member, and the first clamping plate and the second clamping plate can be rotatably arranged on the On the screening cylinder, one end of the elastic member is fixed on the first clamping plate, and the other end is fixed on the second clamping plate, and the elastic member always drives the first clamping plate and the second clamping plate The angle between them becomes larger; the first transmission member is fixedly arranged on the first splint, the second transmission member is fixed on the second splint, and the third transmission member is fixed on the On the screening cylinder, the movement of the first transmission part drives the movement of the third transmission part, and the movement of the third transmission part drives the movement of the second transmission part; during the reciprocating rotation of the sleeve, the workpiece Distributed between the first clamping plate and the second clamping plate in the axial direction of the sleeve; A guide is fixedly arranged on the first splint, a first guide passage and a second guide passage are arranged on the sleeve, and when the guide moves along the first guide passage, the first splint and the second guide passage The included angle between the second clamping plates remains unchanged; when the guide moves along the second guide channel, the guide drives the first clamping plate to move relative to the screening cylinder, and the guide The movement of the first splint drives the movement of the second splint, and the angle between the first splint and the second splint becomes smaller. 2 . The screening device for processing valve fittings according to claim 1 , wherein the sectional surface of the inner circumference of the screening cylinder along the axial direction of the screening cylinder is hexagonal. 3 . 3. The screening device for processing valve fittings according to claim 1 or 2, further comprising a discharge member fixedly arranged on the sleeve, the clamping mechanism The released workpieces enter the discharge member. 4. The screening device for processing valve fittings according to claim 3, characterized in that, the discharge member is provided with a stopper, and the stopper is used to prevent the grinding material from entering the discharge within the file. 5 . The screening device for processing valve fittings according to claim 4 , further comprising a collecting part, the collecting part is used to collect the workpieces discharged by the discharging part. 6 . 6. The screening device for processing valve fittings according to claim 1, further comprising a first driving member and a second driving member, the first driving member is used to drive the movement of the sleeve; The second driving member is used to drive the screening cylinder to move.

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