Buffering device at stroke tail end of pneumatic valve

Abstract

The utility model relates to a buffer device at the stroke tail end of a pneumatic valve, which comprises a support and at least one buffer component and a shaft sleeve in the support, the bottom end of the shaft sleeve is connected with a valve rod, the valve rod penetrates out of the bottom surface of the support and is connected with a valve body, and the top end of the shaft sleeve penetrates out of the top surface of the support and is connected with a cylinder, so that the buffer device is connected with the cylinder and the valve body; the buffering assembly comprises a hydraulic buffer and a rotatable check block, the check block comprises a cylindrical connecting part and a fan-shaped rotating part, the shaft sleeve is sleeved with the connecting part, so that the shaft sleeve can drive the check block to rotate together, and the rotating part protrudes in the direction away from the shaft sleeve; the hydraulic buffer is fixed to the side face of the support, a piston rod of the hydraulic buffer is located in the support, the edge of the rotating part can touch the free end of the piston rod during rotation, and the piston rod contracts towards the interior of the hydraulic buffer to buffer rotation of the check block.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to a buffer device at the end of the stroke of a pneumatic valve. Background Art

[0002] In the application of rapid opening and closing of pneumatic valves, the time for the cylinder piston to move from the start to contact the limit device and end the movement is short, and the impact force is large. The excessive impact force will not only cause vibration of the valve and pipeline, but also affect the service life of the cylinder and valve body. It may also cause problems such as wear of the limit device or damage to the cylinder end cover, resulting in cylinder failure and affecting the stable operation of the valve. At present, generally only large-torque and heavy-duty cylinders have end buffer devices, and light cylinders for general rapid opening and closing applications do not have end buffer devices and do not have end buffer functions. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is that light cylinders for general rapid opening and closing applications do not have end buffer devices and do not have end buffer functions, and the excessive impact force affects the stable operation of the cylinder and valve body.

[0004] In view of the above problems, the utility model provides a buffer device at the end of the stroke of a pneumatic valve, which includes a bracket and at least one buffer component and a bushing inside the bracket. The bottom end of the bushing is connected to the valve stem, the valve stem passes through the bottom surface of the bracket and is connected to the valve body, and the top end of the bushing passes through the top surface of the bracket and is connected to the cylinder, realizing the connection of the buffer device with the cylinder and the valve body;

[0005] The buffer component includes a hydraulic buffer and a rotatable stopper. The stopper includes a cylindrical connecting portion and a fan-shaped rotating portion. The connecting portion is sleeved on the bushing so that the bushing can drive the stopper to rotate together, and the rotating portion protrudes away from the bushing; the hydraulic buffer is fixed on the side surface of the bracket, the piston rod of the hydraulic buffer is inside the bracket, and the edge of the rotating portion can touch the free end of the piston rod during rotation, and the piston rod contracts into the hydraulic buffer to buffer the rotation of the stopper.

[0006] Optionally, the bracket is a rectangular frame body, which has a top surface, a bottom surface and two side surfaces. The top surface is used to support the cylinder, the bottom surface is used to connect the valve body, and the side surfaces provide support force and protect the buffer component and the bushing inside the bracket.

[0007] Further optionally, a plurality of bottom screw holes are provided on the bottom surface of the bracket, and the bracket and the valve body are connected by bolts; a plurality of top screw holes are provided on the top surface of the bracket, and the bracket and the cylinder are connected by bolts.

[0008] Optionally, the bushing includes a first shaft body, a second shaft body and a third shaft body from top to bottom. The first shaft body is cylindrical, the second shaft body is cubic, and the third shaft body is circular. The first shaft body, the second shaft body and the third shaft body are integrally formed;

[0009] The upper part of the first shaft body is provided with a plurality of inwardly recessed key grooves for connecting the drive shaft of the cylinder; the third shaft body has a through hole 1, and the second shaft body has an inner hole, and the inner hole communicates with the through hole 1.

[0010] Further optionally, both the through hole 1 and the inner hole are rectangular and have the same size; the bottom surface of the inner hole is flush with the bottom surface of the second shaft body, and the inner hole protrudes inward and upward into the second shaft body for connecting the top of the valve stem.

[0011] Optionally, the bottom of the valve stem is fixedly connected to the valve body, the cross-section of the valve stem is rectangular, and it can fit the through hole 1 and the inner hole. The valve stem vertically penetrates the bottom surface of the bracket and extends into the interior of the bracket. The top of the valve stem is sequentially inserted into the through hole 1 and the inner hole to complete the connection between the valve stem and the bushing.

[0012] Optionally, a through hole 2 is provided at the center of the connecting portion. The through hole 2 is rectangular and is adapted to the size of the second shaft body, so that the second shaft body can be inserted into the through hole 2, thereby sleeving the stop block on the bushing.

[0013] Optionally, the rotating portion and the connecting portion are concentrically arranged and integrally formed. The arc-shaped side of the rotating portion is away from the through hole 2; both sides of the rotating portion are straight-line sides. One end of the straight-line side is connected to the end of the arc-shaped side, and the other end is connected to the edge of the connecting portion and points to the center of the stop block; the included angle between the two straight-line sides is 90°; the stop block is centered on the bushing, and the rotating portion can rotate horizontally.

[0014] Optionally, the hydraulic buffer includes a hydraulic cylinder and a piston rod, which is a conventional hydraulic buffer. The end of the piston rod away from the hydraulic cylinder is a free end, and the free end points to the interior of the bracket. Two nuts are sleeved on the outer side surface of the hydraulic cylinder, and the nuts are vertical;

[0015] One side of the bracket is an installation surface. An installation through hole is provided on the installation surface corresponding to the height of the stop block. The hydraulic cylinder horizontally passes through the installation through hole. One nut is inside the installation surface, and the other nut is outside the installation surface. The installation surface is clamped between the two nuts, and the nuts are closely attached to the installation surface to maintain the horizontal posture of the hydraulic buffer.

[0016] Further optionally, the installation through hole is close to the edge of the installation surface, so that the hydraulic buffer is close to the open side of the bracket, and further the piston rod is on the movement track of the rotating portion and can touch the straight-line side of the rotating portion.

[0017] Further optionally, two hydraulic buffers are installed on the installation surface, and the two installation through holes are respectively close to the two side edges of the installation surface, so that the two hydraulic buffers are respectively close to the two open sides of the bracket, and further the two piston rods are in two opposite positions on the movement track of the rotating part, and one piston rod corresponds to one linear side of the rotating part.

[0018] The buffer device at the end of the stroke of the pneumatic valve of the present utility model has the following beneficial effects:

[0019] (1) The buffer device is arranged between the cylinder and the valve body. The cylinder is connected upward through the bushing, the valve stem is connected downward, and the stop block is connected in the middle. The movement of the valve stem is transmitted to the stop block. When the stop block rotates, it touches the piston rod of the hydraulic buffer. Finally, the buffer of the movement of the stop block is realized through the expansion and contraction of the piston rod, and the buffer of the cylinder is indirectly realized through the bushing, realizing the buffer at the end of the stroke of quickly opening and closing the pneumatic valve;

[0020] (2) The buffer device has a simple structure. The cooperation of the bushing, the stop block and the hydraulic buffer is simple and reasonable, the cost is not high, and it is convenient to maintain. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the buffer device at the end of the stroke of the pneumatic valve;

[0022] Figure 2 is a top view schematic diagram of the bracket;

[0023] Figure 3 is a schematic diagram of the bushing;

[0024] Figure 4 is a schematic diagram of the stop block.

[0025] In the drawings, 1 - bracket, 2 - bushing, 3 - valve stem, 4 - valve body, 5 - cylinder, 6 - stop block, 7 - hydraulic buffer, 8 - connecting part, 9 - rotating part, 10 - piston rod, 11 - installation surface, 12 - first shaft body, 13 - second shaft body, 14 - third shaft body, 15 - keyway, 16 - through hole one, 17 - through hole two, 18 - nut, 19 - arc side, 20 - linear side. Detailed Embodiment

[0026] This embodiment provides a buffer device at the end of the stroke of a pneumatic valve, as Figures 1-4 shown, including a bracket 1 and at least one buffer assembly and a bushing 2 inside the bracket 1. The bottom end of the bushing 2 is connected to the valve stem 3, the valve stem 3 passes through the bottom surface of the bracket 1 and is connected to the valve body 4, and the top end of the bushing 2 passes through the top surface of the bracket 1 and is connected to the cylinder 5, realizing the connection of the buffer device with the cylinder 5 and the valve body 4;

[0027] The buffer assembly includes a hydraulic buffer 7 and a rotatable stopper 6. The stopper 6 includes a cylindrical connecting portion 8 and a fan-shaped rotating portion 9. The connecting portion 8 is sleeved on the bushing 2, so that the bushing 2 can drive the stopper 6 to rotate together. The rotating portion 9 protrudes away from the bushing 2. The hydraulic buffer 7 is fixed to the side of the bracket 1. The piston rod 10 of the hydraulic buffer 7 is inside the bracket 1. The edge of the rotating portion 9 can touch the free end of the piston rod 10 during rotation, and the piston rod 10 contracts into the hydraulic buffer 7 to buffer the rotation of the stopper 6.

[0028] Optionally, the bracket 1 is a rectangular frame with a top surface, a bottom surface and two side surfaces. The top surface is used to support the cylinder 5, the bottom surface is used to connect the valve body 4, and the side surfaces provide support force and protect the buffer assembly and the bushing 2 inside the bracket 1.

[0029] Further optionally, the bottom surface of the bracket 1 is provided with a plurality of bottom screw holes, and the bracket 1 and the valve body 4 are connected by bolts; the top surface of the bracket 1 is provided with a plurality of top screw holes, and the bracket 1 and the cylinder 5 are connected by bolts.

[0030] Optionally, the bushing 2 includes a first shaft body 12, a second shaft body 13 and a third shaft body 14 from top to bottom. The first shaft body 12 is cylindrical, the second shaft body 13 is cubic, and the third shaft body 14 is circular. The first shaft body 12, the second shaft body 13 and the third shaft body 14 are integrally formed;

[0031] The upper part of the first shaft body 12 is provided with a plurality of inwardly recessed key grooves 15 for connecting the drive shaft of the cylinder 5; the third shaft body 14 has a through hole one 16, and the second shaft body 13 has an inner hole, and the inner hole communicates with the through hole one 16.

[0032] The first shaft body 12 is solid.

[0033] Further optionally, the key grooves 15 are vertical long strips, the key grooves 15 are arranged on the outer side surface of the first shaft body 12, and a plurality of key grooves 15 are evenly arranged along the circumferential direction of the first shaft body 12.

[0034] Further optionally, the through hole one 16 and the inner hole are both rectangular and have the same size; the bottom surface of the inner hole is flush with the bottom surface of the second shaft body 13, and the inner hole protrudes and sinks upward into the second shaft body 13 for connecting the top of the valve stem 3.

[0035] Optionally, the bottom of the valve stem 3 is fixedly connected to the valve body 4. The cross-section of the valve stem 3 is rectangular and can fit the through hole one 16 and the inner hole. The valve stem 3 vertically penetrates the bottom surface of the bracket 1 and extends into the bracket 1. The top of the valve stem 3 is sequentially inserted into the through hole one 16 and the inner hole to complete the connection between the valve stem 3 and the bushing 2, so that the kinetic energy of the cylinder 5 can be transmitted to the valve body 4 through the bushing 2 and the valve stem 3, and then drive the valve body 4 to open and close.

[0036] Optionally, a second through hole 17 is provided at the center of the connecting portion 8. The second through hole 17 is rectangular and adapted to the size of the second shaft body 13, so that the second shaft body 13 can be inserted into the second through hole 17, thereby sleeving the stopper 6 on the sleeve 2.

[0037] Optionally, the rotating portion 9 is concentric with and integrally formed with the connecting portion 8. The arc-shaped side 19 of the rotating portion 9 is away from the second through hole 17; both sides of the rotating portion 9 are straight-shaped sides 20. One end of the straight-shaped side 20 is connected to the end of the arc-shaped side 19, and the other end is connected to the edge of the connecting portion 8 and points to the center of the stopper 6; the included angle between the two straight-shaped sides 20 is 90°; with the sleeve 2 as the center, the rotating portion 9 can rotate horizontally.

[0038] Optionally, the hydraulic buffer 7 includes a hydraulic cylinder and a piston rod 10, which is a conventional hydraulic buffer 7. The end of the piston rod 10 away from the hydraulic cylinder is a free end, and the free end points to the inside of the bracket 1. Two nuts are sleeved on the outer side of the hydraulic cylinder, and the nuts are vertical;

[0039] One side of the bracket 1 is an installation surface 11. The installation surface 11 is provided with an installation through hole corresponding to the height of the stopper 6. The hydraulic cylinder horizontally passes through the installation through hole. One nut is inside the installation surface 11, and the other nut is outside the installation surface 11. The installation surface 11 is clamped between the two nuts, and the nuts are in close contact with the installation surface 11 to keep the hydraulic buffer 7 in a horizontal posture.

[0040] Further optionally, the installation through hole is close to the edge of the installation surface 11, so that the hydraulic buffer 7 is close to the open side of the bracket 1, and further, the piston rod 10 is on the movement track of the rotating portion 9 and can touch the straight-shaped side of the rotating portion 9.

[0041] In the present utility model, the driving shaft of the air cylinder 5 is clamped to the first shaft body 12 through a plurality of key grooves 15. The top of the valve rod 3 is clamped to the second shaft body 13 and the third shaft body 14 through a rectangular first through hole 16 and an inner hole. The connecting portion 8 of the stopper 6 is connected to the second shaft body 13 through a rectangular second through hole 17. The above connection method enables the sleeve 2 to drive the stopper 6 and the valve rod 3 to rotate horizontally, and transmits the torque of the air cylinder 5 to the valve body 4.

[0042] During use, when the valve needs to be closed or opened, the air cylinder 5 drives the stopper 6 and the valve rod 3 to rotate simultaneously through the sleeve 2. When the straight-shaped side of the rotating portion 9 of the stopper 6 rotates to the free end of the piston rod 10, the straight-shaped side contacts and presses the piston rod 10, causing the piston rod 10 to move towards the hydraulic cylinder. The pressure in the hydraulic cylinder resists the movement of the piston rod 10, indirectly preventing the rotation of the stopper 6, and realizing end buffering through the damping effect of the hydraulic oil.

[0043] Further optionally, two hydraulic buffers 7 are installed on the mounting surface 11, and the two mounting through holes are respectively close to the two side edges of the mounting surface 11, so that the two hydraulic buffers 7 are respectively close to the two open sides of the bracket 1, and further, the two piston rods 10 are located at two opposite positions on the movement track of the rotating part 9, and one piston rod 10 corresponds to a linear side of the rotating part 9.

[0044] During use, when the stopper 6 rotates, when a linear side touches and presses the corresponding first piston rod 10, the corresponding hydraulic cylinder can provide a buffering force to prevent the stopper 6 from rotating excessively and prevent the valve stem 3 from rotating excessively at the same time; when the stopper 6 rotates in the opposite direction, the other linear side touches and presses the corresponding second piston rod 10, and the corresponding hydraulic cylinder can provide a buffering force to prevent the stopper 6 from rotating excessively and prevent the valve stem 3 from rotating excessively at the same time. As described above, the two hydraulic buffers 7 can respectively prevent the stopper 6 from rotating in the clockwise and counterclockwise directions, and thus the buffering during the opening and closing of the valve can be achieved.

[0045] Further optionally, several stoppers 6 can be arranged from top to bottom in the buffer device, stacked on each other, and the rotating parts 9 of the several stoppers 6 are correspondingly arranged up and down, and rotate together with the bushing 2. Each stopper 6 corresponds to one or two hydraulic buffers 7; the hydraulic buffers 7 on the mounting surface 11 are also correspondingly arranged from top to bottom.

[0046] The utility model realizes the buffering at the end of the stroke of quickly opening and closing a pneumatic valve through the interaction of the hydraulic buffer 7, the stopper 6, the bushing 2 and the valve stem 3. The hydraulic buffer 7 is selected as an adjustable hydraulic buffer 7. By adjusting the type selection and setting of the hydraulic buffer 7, the stroke and buffering effect of the valve end buffering can be adjusted, the mechanical impact during the opening and closing of the valve can be reduced or eliminated, and the service life and reliability of the valve can be improved.

[0047] By selecting hydraulic buffers 7 with different buffer strokes, the length of the buffer stroke can be adjusted. By adjusting the damping setting of the hydraulic buffer 7, the buffering effect can be adjusted. The number of hydraulic buffers 7 is selected according to the force condition.

Claims

1. A buffer device for the end of the stroke of a pneumatic valve, characterized in that: It includes a bracket and at least one buffer assembly and a sleeve inside the bracket, the bottom end of the sleeve is connected to the valve stem, the valve stem passes through the bottom surface of the bracket and is connected to the valve body, and the top end of the sleeve passes through the top surface of the bracket and is connected to the cylinder, so as to realize the connection between the buffer device, the cylinder and the valve body; The buffer assembly includes a hydraulic buffer and a rotatable block, the block includes a cylindrical connecting portion and a fan-shaped rotating portion, the connecting portion is sleeved on the shaft sleeve so that the shaft sleeve can drive the block to rotate together, and the rotating portion protrudes in the direction away from the shaft sleeve; the hydraulic buffer is fixed to the side of the bracket, the piston rod of the hydraulic buffer is inside the bracket, the edge of the rotating portion can touch the free end of the piston rod when rotating, and the piston rod contracts into the hydraulic buffer to buffer the rotation of the block.

2. The pneumatic valve stroke end buffer device according to claim 1, characterized in that: The bracket is a rectangular frame having a top surface, a bottom surface and side surfaces on both sides, the top surface is used to support the cylinder, the bottom surface is used to connect the valve body, and the side surfaces provide support force and protect the buffer assembly and the shaft sleeve inside the bracket; The bottom surface of the bracket is provided with a plurality of bottom screw holes, through which the bracket and the valve body are connected; the top surface of the bracket is provided with a plurality of top screw holes, through which the bracket and the cylinder are connected.

3. The pneumatic valve stroke end buffer device according to claim 1, characterized in that: The sleeve includes a first shaft body, a second shaft body and a third shaft body from top to bottom, the first shaft body is cylindrical, the second shaft body is a cube, the third shaft body is circular, and the first shaft body, the second shaft body and the third shaft body are integrally formed; The upper part of the first shaft body is provided with a plurality of inwardly recessed keyways for connecting the driving shaft of the cylinder; the third shaft body has a through hole 1, and the second shaft body has an inner hole, and the inner hole and the through hole 1 are communicated with each other.

4. The pneumatic valve stroke end buffer device according to claim 3, characterized in that: The through hole 1 and the inner hole are both rectangular and have the same size; the bottom surface of the inner hole is flush with the bottom surface of the second shaft body, and the inner hole protrudes and recesses upward toward the inside of the second shaft body, and is used to connect to the top of the valve stem.

5. The pneumatic valve stroke end buffer device according to claim 4, characterized in that: The bottom of the valve stem is fixedly connected to the valve body. The cross-section of the valve stem is rectangular and can fit into the through hole 1 and the inner hole. The valve stem vertically penetrates the bottom surface of the bracket and extends into the inside of the bracket. The top of the valve stem is inserted into the through hole 1 and the inner hole in turn to complete the connection between the valve stem and the sleeve.

6. The pneumatic valve stroke end buffer device according to claim 1, characterized in that: A second through hole is provided at the center of the connecting portion. The second through hole is rectangular and matches the size of the second shaft body, so that the second shaft body can be inserted into the second through hole, thereby sleeve-connecting the stopper on the shaft sleeve.

7. The pneumatic valve stroke end buffer device according to claim 6, characterized in that: The rotating part and the connecting part are concentrically arranged and integrally formed, and the arc-shaped side of the rotating part is away from the second through hole; the two sides of the rotating part are respectively straight side, one end of the straight side is connected to the end of the arc-shaped side, and the other end is connected to the edge of the connecting part and points to the center of the block; the angle between the two straight side is 90°; the block is centered on the shaft sleeve, and the rotating part can rotate horizontally.

8. The pneumatic valve stroke end buffer device according to claim 7, characterized in that: The hydraulic buffer comprises a hydraulic cylinder and a piston rod, wherein the end of the piston rod away from the hydraulic cylinder is a free end, the free end points to the inside of the bracket, and the outer side of the hydraulic cylinder is sleeved with two nuts, and the nuts are vertical; One side of the bracket is a mounting surface, and a mounting through hole is provided on the mounting surface at a height corresponding to the block. The hydraulic cylinder passes through the mounting through hole horizontally, one nut is located on the inner side of the mounting surface, and the other nut is located on the outer side of the mounting surface. The mounting surface is clamped between the two nuts, and the nuts are tightly attached to the mounting surface to maintain the horizontal posture of the hydraulic buffer.

9. The pneumatic valve stroke end buffer device according to claim 8, characterized in that: The mounting through hole is close to the edge of the mounting surface, so that the hydraulic buffer is close to the open side of the bracket, and the piston rod is located on the movement trajectory of the rotating part and can touch the straight side of the rotating part.

10. The pneumatic valve stroke end buffer device according to claim 8, characterized in that: Two hydraulic buffers are installed on the mounting surface, and the two mounting through holes are respectively close to the two side edges of the mounting surface, so that the two hydraulic buffers are respectively close to the two sides of the opening of the bracket, so that the two piston rods are at two relative positions on the motion trajectory of the rotating part, and one piston rod corresponds to a straight side of the rotating part.

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