Grinding device and grinding equipment for inner sealing surface of valve body

Abstract

The utility model belongs to the technical field of grinding machinery, and particularly relates to a grinder and grinding equipment for a sealing surface in a valve body, the grinder comprises a rotating shaft, and further comprises a self-adaptive lifting floating piece of which the upper end is at least partially connected with the rotating shaft in a sleeving manner, the self-adaptive lifting floating part and the rotating shaft are fixedly connected in the circumferential direction and distributed on a vertical shaft, the lower end of the self-adaptive lifting floating part is free, and a swing type plane grinding head rotating around a transverse shaft perpendicular to the vertical shaft is hinged to the lower end of the self-adaptive lifting floating part. The swing type plane grinding head is hinged to the lower end of the self-adaptive lifting floating piece through a transverse shaft, so that the swing type plane grinding head can change in angle around the transverse shaft, a grinding layer can be matched with an annular grinding face in a valve body in angle, and the grinding layer is fully attached to the grinding face under the continuous downward pressing effect of the self-adaptive lifting floating piece. And uniform grinding is carried out along with rotation.

Description

Technical Field

[0001] The utility model belongs to the technical field of grinding machinery, and in particular relates to a grinder, grinding equipment and a grinding method for a sealing surface in a valve body. Background Art

[0002] Grinding is the finishing process (such as cutting) of the machined surface by using abrasive particles coated or pressed on the grinding tool through the relative movement of the grinding tool and the workpiece under a certain pressure. Grinding can be used to process various metal and non-metal materials, and the processed surface shapes include planes, internal and external cylindrical and conical surfaces, convex and concave spherical surfaces, threads, tooth surfaces and other surfaces.

[0003] The grinding tool for valve bodies of various calibers disclosed in patent CN214923071U includes a support plate mounted on the valve body mouth, a grinding rod is passed through the center of the support plate, the grinding rod extends into the inner hole of the valve body, and a grinding head for grinding the valve seat sealing surface is installed at the inner end, the grinding rod and the support plate are rotatably connected, and a positioning assembly for positioning is also installed at the bottom of the support plate, and the positioning assembly has the action of adjusting according to the size of the inner hole of the valve body. The grinding tool for valve bodies of various calibers of the utility model adopts a support plate mounted on the valve body mouth, and a grinding rod is used to extend into the valve body and contact the valve seat sealing surface, and the grinding head installed at the end of the grinding rod grinds the valve seat sealing surface, and the grinding head can be disassembled and replaced to meet the needs of valve seats with different sealing surfaces; in addition, the adjustable slider is engaged with the valve seat opening to ensure that the grinding process will not be eccentric, and it can be adjusted according to valve seats of different sizes, which is simple and convenient.

[0004] In the above scheme, an adjustable positioning component is used to abut against the valve body to achieve positioning, so that the grinding head can stably fall on the axis center for grinding. However, there are various undulating and concave structures in the valve body, and the grinding head cannot adaptively fit the non-horizontal grinding surface therein, which will cause uneven grinding surface or even excessive wear of the raised parts, seriously affecting the airtight performance of the valve body. Utility Model Content

[0005] The purpose of the utility model is to provide a grinding device, a grinding device and a grinding method for the sealing surface in a valve body which can solve the above technical problems in view of the above problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A grinder for the sealing surface in the valve body, the grinder comprising a rotating shaft, the grinder further comprising an adaptive lifting and floating member at least partially sleeved with the rotating shaft at the upper end, the adaptive lifting and floating member being circumferentially fixedly connected to the rotating shaft and distributed on the vertical shaft;

[0008] In the axial direction of the vertical axis, the adaptive lifting and floating member is free to rise and fall relative to the rotating axis and is provided with a spring forcing the adaptive lifting and floating member to always have a downward movement tendency;

[0009] The lower end of the adaptive lifting and floating member is free, and a swinging plane grinding head rotating around a transverse axis perpendicular to the vertical axis is hingedly connected to the lower end of the adaptive lifting and floating member;

[0010] During grinding, the grinding working plane of the swing-type plane grinding head always matches the inner annular grinding surface arranged inside the valve body.

[0011] In the grinder for the sealing surface in the valve body, an upper limit surface is provided at the lower end of the adaptive lifting and floating part, and a lower limit surface located below the upper limit surface is provided at the upper end of the swing type plane grinding head, and a swing adjustment gap is left between the upper limit surface and the lower limit surface.

[0012] In the grinder for the sealing surface inside the valve body, the swing angle of the swing-type plane grinding head is an acute angle less than 5°.

[0013] In the grinder for the sealing surface inside the valve body, a lower convex portion is provided at the lower end of the adaptive lifting and floating part, and a groove for the lower convex portion to be inserted into and to be gap-matched with the lower convex portion is provided inside the upper end of the swinging surface grinding head, as well as a reserved gap between the lower surface of the lower convex portion and the bottom of the groove.

[0014] In the valve body inner sealing surface grinder, a hinge shaft at least partially exposed in the groove is radially penetrated through the upper end of the swing-type plane grinding head, and a through hole for the hinge shaft to penetrate is radially provided on the lower convex portion.

[0015] In the grinder for the sealing surface in the valve body, a mating hole arranged axially along the vertical axis is provided at the end of the adaptive lifting and floating part away from the swinging surface grinding head, the lower end of the rotating shaft is inserted into the mating hole and the two are slidably fitted, and the spring is provided between the bottom of the mating hole and the lower end surface of the rotating shaft.

[0016] In the grinding device for the sealing surface in the valve body, a guide shaft is penetrated in the radial direction of the adaptive lifting and floating member, and a guide hole which is slidably matched with the guide shaft is provided on the rotating shaft.

[0017] The utility model provides a valve body inner sealing surface grinding device, comprising a frame, on which a plurality of valve body positioning jigs distributed in a ring shape are arranged, the frame is also provided with a lifting frame located above the valve body positioning jigs, and a lifting drive mechanism for driving the lifting frame to lift and lower, the lifting frame is provided with a plurality of valve body inner sealing surface grinders corresponding one to one with the valve body positioning jigs, and the valve body inner sealing surface grinders rotate synchronously.

[0018] In the grinding device for the sealing surface inside the valve body, the valve body positioning fixture is fixed on a rotating disk.

[0019] The utility model provides a method for grinding a sealing surface in a valve body, using the grinding device for grinding a sealing surface in a valve body, and the grinding method comprises the following steps:

[0020] S1. Clamping: fix the valve body with the inner annular grinding surface to be ground on the valve body positioning fixture in an upright state;

[0021] S2, rapid lifting, the lifting frame is driven by the lifting power to make the grinding device of the sealing surface of the valve body in the rotating state enter the valve body in S1;

[0022] S3, slow lifting, when the lifting frame in S2 drives the grinder of the sealing surface inside the valve body to at least partially contact the grinding inner annular grinding surface, the lifting speed of the lifting frame is reduced, so that the swing-type plane grinding head of the grinder of the sealing surface inside the valve body rotates relative to the adaptive lifting floating member around the transverse axis perpendicular to the vertical axis, and the grinding inner annular grinding surface is forced to coincide with the grinding working plane of the swing-type plane grinding head under the spring elasticity of the grinder of the sealing surface inside the valve body;

[0023] S4, grinding, so that the grinder of the sealing surface inside the valve body in S3 rotates around the vertical axis for a set time, that is, the matching grinding of the inner annular grinding surface is completed.

[0024] The advantages of the utility model are:

[0025] The swing-type plane grinding head is hinged at the lower end of the adaptive lifting and floating part through a transverse axis, so that the swing-type plane grinding head can change its angle around the transverse axis, so that the grinding layer can adapt to the angle of the annular grinding surface inside the valve body, and fully fit on the grinding surface under the continuous downward pressure of the adaptive lifting and floating part, and grind evenly with rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the grinder of the utility model.

[0027] Figure 2 It is a schematic diagram of the side structure of the grinder of the utility model.

[0028] Figure 3 This is a schematic diagram of the cooperation between the grinder and the valve body of the utility model.

[0029] Figure 4 This is a schematic diagram of the structure of the adaptive lifting floating member of the utility model.

[0030] Figure 5 This is a schematic diagram of the structure of the swing type plane grinding head of the utility model.

[0031] Figure 6 This is a schematic diagram of the rotating shaft structure of the utility model.

[0032] Figure 7 This is a schematic diagram of the structure of the grinder equipment of the utility model.

[0033] Figure 8 This is a schematic diagram of the structure of the valve body positioning fixture of the utility model.

[0034] In the figure, there are a rotating shaft 1, a guide shaft 11, a guide hole 12, an adaptive lifting floating part 2, a spring 21, an upper limit surface 22, a lower protrusion 23, a through hole 24, a matching hole 25, a vertical shaft 3, a horizontal shaft 4, a swinging plane grinding head 5, a grinding working plane 51, a lower limit surface 52, a groove 53, a hinge shaft 54, a valve body 6, an inner annular grinding surface 61, a frame 7, a valve body positioning fixture 71, a lifting frame 72, a lifting drive mechanism 73, a rotating disk 74, a semi-cylinder 75, an arc clamp block 76, and a sliding guide rail 77. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments.

[0036] Example 1

[0037] like Figure 1-Figure 6 As shown, a grinder for the sealing surface in a valve body comprises a rotating shaft 1, and is characterized in that the grinder further comprises an adaptive lifting and floating member 2 at the upper end of which at least a part is sleeved with the rotating shaft 1, and the adaptive lifting and floating member 2 is circumferentially fixedly connected with the rotating shaft 1 and distributed on a vertical shaft 3;

[0038] In the axial direction of the vertical axis 3, the adaptive lifting and floating member 2 is free to rise and fall relative to the rotating axis 1 and is provided with a spring 21 forcing the adaptive lifting and floating member 2 to always have a downward movement tendency;

[0039] The lower end of the adaptive lifting and floating member 2 is free, and a swinging plane grinding head 5 is hingedly connected to the lower end of the adaptive lifting and floating member 2 and rotates around a transverse axis 4 perpendicular to the vertical axis 3;

[0040] During grinding, the grinding working plane 51 of the swinging plane grinding head 5 and the inner annular grinding surface 61 disposed inside the valve body 6 always coincide with each other.

[0041] That is, the swinging plane grinding head 5 is hinged at the lower end of the adaptive lifting floating member 2 through the transverse axis 4, so that the swinging plane grinding head 5 can change its angle around the transverse axis 4, so that the grinding layer can adapt to the 1 angles of the annular grinding surface 6 inside the valve body 6, and can fully fit on the grinding surface under the continuous downward pressure of the adaptive lifting floating member 2, and grind evenly with rotation.

[0042] In this embodiment, an upper limit surface 22 is provided at the lower end of the adaptive lifting and floating member 2, and a lower limit surface 52 located below the upper limit surface 22 is provided at the upper end of the swing type plane grinding head 5, and a swing adjustment gap is left between the upper limit surface 22 and the lower limit surface 52.

[0043] The gap between the upper limit surface 22 and the lower limit surface 52 is the maximum swing angle of the swing type surface grinding head 5 . When the swing type surface grinding head 5 rotates to the maximum swing angle, the upper limit surfaces 22 abut against each other.

[0044] In this embodiment, the swing angle of the swing type surface grinding head 5 is an acute angle less than 5°.

[0045] In actual use, it will be adjusted according to the specific shape of the inner annular grinding surface 61 inside the valve body 6, but it will always be kept within an angle of 45°. This is because when the swing angle of the rocking plane grinding head 5 is greater than 45°, the downward pressure provided by the adaptive lifting and floating part 2 will produce an excessively large horizontal component force, which will seriously affect the self-rotation stability of the adaptive lifting and floating part 2.

[0046] Generally, maximum swing angle values ​​of 1°, 2° and 3° are used for small valve bodies, and maximum swing angle values ​​of 10°, 20° and 30° are used for large valve bodies.

[0047] In this embodiment, a lower protrusion 23 is provided at the lower end of the adaptive lifting and floating member 2, and a groove 53 is provided inside the upper end of the swinging surface grinding head 5 for the lower protrusion 23 to be inserted into and with a clearance fit with the lower protrusion 23, as well as a reserved gap between the lower surface of the lower protrusion 23 and the bottom of the groove 53.

[0048] The length of the lower protrusion 23 is equivalent to the depth of the groove 53, so the reserved gap between the lower surface of the lower protrusion 23 and the bottom of the groove 53 is equal to the distance between the upper limit surface 22 and the lower limit surface 52. When the upper limit surface 22 and the lower limit surface 52 contact to reach the maximum angle, the lower surface of the lower protrusion 23 also contacts the bottom of the groove 53. The two inner and outer contact points can jointly limit the swing angle of the swing type surface grinding head 5 to avoid the impact and damage of a single contact point affecting the accuracy of the angle limit.

[0049] At the same time, there is also a gap between the lower convex portion 23 and the side wall of the groove 53, so that the swing-type surface grinding head 5 has enough space to reach the limit of the swing angle when swinging. It can also be set so that when the swing limit is reached, the lower convex portion 23 and the side wall of the groove 53 are just in contact, forming a three-point abutment restriction to improve the reliability of the swing limit position.

[0050] Preferably, a hinge shaft 54 ​​at least partially exposed in the groove 53 is radially penetrated through the upper end of the oscillating surface grinding head 5 , and a through hole 24 for the hinge shaft 54 ​​to penetrate is radially provided in the lower protrusion 23 .

[0051] The hinge shaft 54 ​​is horizontally mounted in the groove 53 along the diameter of the swing type surface grinding head 5, and passes through the through hole 24 also horizontally opened along the diameter. A radial through hole can also be opened when the lower protrusion 23 and the groove 53 are spliced, and the hinge shaft 54 ​​in the form of a bolt passes through the through hole and is fixed with a nut.

[0052] In this embodiment, a mating hole 25 is provided at the end of the adaptive lifting floating part 2 away from the swinging surface grinding head 5 and is axially arranged along the vertical axis 3. The lower end of the rotating shaft 1 is inserted into the mating hole 25 and the two are slidably fitted. A spring 21 is provided between the bottom of the mating hole 25 and the lower end surface of the rotating shaft 1.

[0053] The matching hole 25 is used as a guide track for the rotating shaft 1, limiting the rotating shaft 1 to be able to telescope only in the axial direction, and the two are connected by a spring 21 in the axial direction so that the two have a continuous force to separate axially from each other. When the rotating shaft 1 is fixed, the adaptive lifting floating part 2 will always have a downward movement tendency.

[0054] Preferably, a guide shaft 11 is penetrated in the radial direction of the adaptive lifting and floating member 2 , and a guide hole 12 slidably matched with the guide shaft 11 is provided on the rotating shaft 1 .

[0055] The guide hole 12 is a waist-shaped through hole opened in the up and down directions. The guide shaft 11 slides vertically in the guide hole 12. When the guide shaft 11 contacts the lower arc surface of the guide hole 12, it is the maximum depth of the rotating shaft 1 extending into the matching hole 25, and when the guide shaft 11 contacts the upper arc surface of the guide hole 12, it is the maximum distance that the rotating shaft 1 withdraws from the matching hole 25.

[0056] The width of the guide hole 12 matches the diameter of the guide shaft 11 , which can provide additional axial guiding capability when the adaptive lifting and floating member 2 performs telescopic movement, and transmit the rotational power of the rotating shaft 1 to the adaptive lifting and floating member 2 .

[0057] Example 2

[0058] like Figure 7-Figure 8As shown, the grinder for the sealing surface inside the valve body in Example 1 is used in the grinding equipment for the sealing surface inside the valve body to improve the grinding effect of the valve body in each positioning fixture.

[0059] The grinding equipment includes a frame 7, on which are disposed a plurality of valve body positioning jigs 71 distributed in a ring shape, a lifting frame 72 located above the valve body positioning jigs 71, and a lifting drive mechanism 73 for driving the lifting frame 72 to move up and down, and a plurality of grinders corresponding to the valve body positioning jigs 71 are disposed on the lifting frame 72, and the grinders on the sealing surface inside the valve body 6 rotate synchronously.

[0060] The valve body positioning fixture 71 is cylindrical and consists of two hinged semi-cylinders, one of which is fixed to the rotating disk 74, and the other semi-cylinder relies on a hinge to realize the splicing and separation of the two semi-cylinders, so as to facilitate the radial placement of the valve body 6 in the fixture to avoid the longer valve body 6 from colliding with the grinder above.

[0061] The inner walls of the two semi-cylinders are provided with removable and replaceable arc-shaped clamping blocks, which are used to contact the outer wall of the valve body 6 and exert circumferential friction resistance on the valve body 6, so that the valve body 6 can maintain a stable state when contacting the rotating grinder. At the same time, bolt-type opening and closing locking parts are installed on the two semi-cylinders to ensure that the arc-shaped clamping blocks clamp the valve body 6.

[0062] The lifting frame 72 and the lifting drive mechanism 73 are arranged with a grinder on the mounting plate of the upper lifting frame 72 in accordance with the installation position of the valve body positioning fixture 71 below. The lifting drive mechanism 73 then drives the entire lifting frame 72 to move up and down to send the swinging surface grinding head 5 into or out of the valve body 6.

[0063] The lifting drive mechanism 73 is driven by a lifting motor, which rotates a screw rod that runs through the center of the mounting plate of the lifting frame 72, and with the cooperation of the sliding guide rails around the mounting plate, the thread of the screw rod is used to realize the rising and falling of the mounting plate.

[0064] The grinder driving mechanism is installed on the top of the frame 7 and is connected to the upper side of the rotating shaft 1. A grinding motor is connected through gears or belts to make each grinder rotate synchronously.

[0065] Of course, multiple grinding motors may be used to drive each grinder respectively, so that each grinder has a different rotation speed, so as to achieve different grinding effects for the valve body 6 at different stations.

[0066] In this embodiment, the valve body positioning fixture 71 is fixed on the rotating disk 74 .

[0067] A rotating disk 74 is also provided on the lower side of the frame 7. The rotating disk 74 is driven by a rotating motor to realize rotation relative to the frame 7. After rotation, each valve body positioning fixture 71 evenly distributed on the rotating disk 74 can rotate the corresponding grinder above, thereby realizing that the valve body 6 can be changed to a work station with different grinding effects by rotating.

[0068] One of the workstations is specifically used for loading and unloading the valve body 6 , so no grinder is correspondingly arranged above this workstation, thereby providing a more spacious space for loading and unloading the valve body 6 .

[0069] Example 3

[0070] The grinding method of the sealing surface inside the valve body produced by the grinding device of the sealing surface inside the valve body in implementation 2 comprises the following steps:

[0071] S1. Clamping: fix the valve body 6 with the inner annular grinding surface 61 to be ground on the valve body positioning fixture 71 in an upright state.

[0072] S2, rapid lifting, the lifting frame 72 is driven by the lifting power to make the grinding device of the sealing surface of the valve body in the rotating state enter the valve body 6 in S1;

[0073] S3, slow lifting, when the lifting frame 72 in S2 drives the grinder of the sealing surface in the valve body to at least partially contact the grinding inner annular grinding surface 61, the lifting speed of the lifting frame 72 is reduced, so that the swing-type plane grinding head 5 of the grinder of the sealing surface in the valve body rotates relative to the adaptive lifting floating member 2 around the transverse axis 4 perpendicular to the vertical axis 3, and the grinding inner annular grinding surface 61 and the grinding working plane 51 of the swing-type plane grinding head 5 are forced to coincide with each other under the elastic action of the spring 21 of the grinder of the sealing surface in the valve body;

[0074] S4, grinding, so that the grinder of the sealing surface inside the valve body in S3 rotates around the vertical axis 3 for a set time, that is, the matching grinding of the inner annular grinding surface 61 is completed.

[0075] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A grinding machine for a sealing surface in a valve body, the grinding machine comprising a rotating shaft (1), characterized in that: The grinder further comprises an adaptive lifting and floating member (2) at the upper end of which at least a portion is sleeved with the rotating shaft (1); the adaptive lifting and floating member (2) and the rotating shaft (1) are circumferentially fixedly connected and distributed on the vertical shaft (3); In the axial direction of the vertical axis (3), the adaptive lifting and floating member (2) is freely lifted and floated relative to the rotating axis (1) and is provided with a spring (21) for forcing the adaptive lifting and floating member (2) to always have a downward movement tendency; The lower end of the adaptive lifting and floating member (2) is free, and a swinging plane grinding head (5) is hingedly connected to the lower end of the adaptive lifting and floating member (2) and rotates around a transverse axis (4) perpendicular to the vertical axis (3).

2. The grinding device for the sealing surface in the valve body according to claim 1, characterized in that: An upper limit surface (22) is provided at the lower end of the adaptive lifting floating member (2), and a lower limit surface (52) located below the upper limit surface (22) is provided at the upper end of the swing type plane grinding head (5), and a swing adjustment gap is left between the upper limit surface (22) and the lower limit surface (52).

3. The grinding device for the sealing surface in the valve body according to claim 1, characterized in that: The swing angle of the swing-type plane grinding head (5) is an acute angle less than 5°.

4. The grinding device for the sealing surface in the valve body according to claim 1, characterized in that: A lower convex portion (23) is provided at the lower end of the adaptive lifting and floating member (2), a groove (53) is provided inside the upper end of the swinging plane grinding head (5) for the lower convex portion (23) to be inserted and for clearance fit with the lower convex portion (23), and a clearance is reserved between the lower surface of the lower convex portion (23) and the bottom of the groove (53).

5. The grinding device for the sealing surface in the valve body according to claim 4, characterized in that: A hinge shaft (54) at least partially exposed in the groove (53) is radially penetrated at the upper end of the oscillating plane grinding head (5), and a through hole (24) for the hinge shaft (54) to penetrate is provided in the radial direction of the lower convex portion (23).

6. The grinding device for the sealing surface in the valve body according to claim 1, characterized in that: A matching hole (25) is provided at one end of the adaptive lifting floating member (2) away from the swinging plane grinding head (5) and is axially arranged along the vertical axis (3). The lower end of the rotating shaft (1) is inserted into the matching hole (25) and the two are slidably matched. The spring (21) is provided between the bottom of the matching hole (25) and the lower end surface of the rotating shaft (1).

7. The grinding device for the sealing surface in the valve body according to claim 6, characterized in that: A guide shaft (11) is radially penetrated through the adaptive lifting and floating member (2), and a guide hole (12) which is slidably matched with the guide shaft (11) is provided on the rotating shaft (1).

8. A grinding device for a sealing surface in a valve body, comprising a frame (7), characterized in that: A plurality of valve body positioning jigs (71) distributed in a ring shape are arranged on the frame (7), a lifting frame (72) located above the valve body positioning jig (71) and a lifting drive mechanism (73) for driving the lifting frame (72) to move up and down are also arranged on the frame (7), a plurality of grinders for the inner sealing surface of the valve body according to any one of claims 1 to 7 corresponding one to one with the valve body positioning jig (71) are arranged on the lifting frame (72), and the grinders for the inner sealing surface of the valve body (6) rotate synchronously.

9. The grinding device for the sealing surface inside the valve body according to claim 8, characterized in that: The valve body positioning fixture (71) is fixed on the rotating disk (74).

Images