Grinding device for mechanical valve body forge piece

Abstract

The invention relates to the technical field of valve body polishing, in particular to a mechanical valve body forging polishing device which comprises a polishing table and a three-coordinate arm on the upper surface of the polishing table. The three-coordinate arm can drive the motor of the output shaft to move at any point position in the three-dimensional direction. Electric push rods are symmetrically arranged on the upper surface of the grinding table; the output end of the electric push rod is fixedly connected with a clamping plate; an output shaft of the motor is fixedly connected with a grinding disc; telescopic grooves with square sections are evenly formed in the arc-shaped outer wall of the grinding disc. The groove bottom of the telescopic groove is connected with a tool apron through a first tension spring; the grinding disc rotates to drive the grinding block at the end of the cutter handle to make uniform contact with the inner wall of the valve body, so that the inner wall of the valve body is ground in the uniform stress state, the grinding efficiency and safety are improved, meanwhile, the grinding device is suitable for the inner diameters of the valve bodies with different diameters, and the application range is wide.

Description

Technical Field

[0001] The invention relates to the technical field of valve body grinding, in particular to a mechanical valve body forging grinding device. Background Art

[0002] As the core control component in the fluid conveying system, the valve has the functions of shutoff, regulation, diversion, non-return, pressure stabilization, diversion and overflow pressure relief, and can adapt to the transmission control of various fluids such as air, water vapor, corrosive media, mud, oil, liquid metal and radioactive media. In the manufacturing process, the valve body is usually formed by forging, and its inner wall needs to be polished after forming. The specific process is: first, place the valve body opening upward on the polishing device platform and fix it through a clamping mechanism; then drive the mechanical arm of the polishing device to adjust the position so that the polishing head extends into the inner cavity of the valve body; start the polishing head drive motor to make it rotate at high speed, and at the same time control the polishing head to contact the inner wall of the valve body; during the polishing process, the platform drives the valve body to rotate in the opposite direction to achieve comprehensive polishing of the inner wall in the circumferential direction; finally, by gradually lowering the height of the polishing head, the entire inner wall surface is processed.

[0003] Since the current valve body grinding generally adopts the grinding of a single grinding head, the contact area between the single grinding head and the inner wall of the valve body is limited, especially for the inner wall of the valve body with a larger diameter, the grinding efficiency is low and it is difficult to meet the production needs; in addition, during the process of grinding the inner wall of the valve body by a single grinding head, the grinding head exerts an extrusion force on the inner wall of the valve body, that is, the direction of the force of the grinding head is perpendicular to the contact surface between the grinding head and the inner wall of the valve body and is outward, so that the valve body will become tilted and other unstable conditions under the extrusion of the grinding head, which will affect the grinding effect and stability on the one hand, and on the other hand, there is a risk of tipping over for some taller valve bodies, and the safety is poor; finally, for some irregular valve bodies such as three-way valves, on the one hand, centrifugal force imbalance will be generated during the high-speed rotation of the valve body, which is easy to tip over, and on the other hand, the irregular outer wall of the valve body will have the risk of collision with surrounding personnel under high-speed rotation, and the safety is relatively low. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art, the present invention proposes a mechanical valve body forging grinding device. The present invention drives the grinding block at the end of the tool handle to evenly contact the inner wall of the valve body through the rotation of the grinding disk, so that the inner wall of the valve body is ground under a uniform force state, and the grinding efficiency and safety are improved. At the same time, it is suitable for valve body inner diameters of different diameters and has a wide range of applications.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: A grinding device for a mechanical valve body forging described in the present invention includes a grinding table and a three-coordinate arm on the upper surface of the grinding table; the three-coordinate arm can drive the motor of the output shaft to move to any point in three-dimensional directions; electric push rods are symmetrically arranged on the upper surface of the grinding table; the output ends of the electric push rods are fixedly connected with clamping plates; the output shaft of the motor is fixedly connected with a grinding disc; the outer arc wall of the grinding disc is uniformly provided with telescopic grooves with a square cross-section; the bottom of the telescopic groove is connected with a tool holder through a first tension spring; the threaded hole on the side of the tool holder away from the first tension spring is threadedly connected with the threaded joint at one end of the tool handle; the other end of the tool handle is fixedly connected with a grinding block; both the tool handle and the tool holder are slidably connected with the telescopic groove.

[0006] Preferably, the tool holder is slidably and sealingly connected with the telescopic groove; an annular groove is arranged inside the grinding disc and below the telescopic groove; an annular plate is slidably and sealingly connected with the annular groove up and down; the lower inner wall of the annular groove penetrates downward and is threadedly and sealingly connected with a first bolt; the lower inner wall of the annular groove is communicated with the bottom of the corresponding telescopic groove through a first liquid hole.

[0007] Preferably, a clamping groove is arranged on the upper surface of the tool holder; a groove corresponding to the clamping groove is arranged on the upper inner wall of the telescopic groove; a clamping block is slidably and sealingly connected in the groove; a second tension spring is connected between the clamping block and the bottom of the groove; the pulling forces of the plurality of second tension springs are different; an internal thread groove is arranged on the lower surface of the grinding disc; a plug is threadedly and sealingly connected with the internal thread groove; the upper end of the internal thread groove is communicated with the bottom of the groove through a second liquid hole.

[0008] Preferably, the plurality of second tension springs are centrosymmetric with the central axis of the grinding disc; the pulling forces of two symmetric second tension springs are the same.

[0009] Preferably, an anti-blocking block is slidably connected to the inner wall of the clamping groove; a first spring is connected between the anti-blocking block and the bottom of the clamping groove; the anti-blocking block is flush with the notch of the clamping groove under the action of the first spring; a linkage groove symmetric to the clamping groove is arranged on the lower surface of the tool holder; a linkage block is slidably connected in the linkage groove; the bottom of the clamping groove and the bottom of the linkage groove penetrate and are movably connected with a linkage rod; the anti-blocking block and the linkage block are connected through the linkage rod; a strengthening groove corresponding to the linkage groove is arranged on the lower inner wall of the telescopic groove.

[0010] Preferably, a grid groove is arranged on the upper surface of the grinding table; a blade groove is obliquely arranged outward on the outer wall of the tool handle; a fan blade is slidably connected in the blade groove; the fan blade is connected with the bottom of the blade groove through a second spring.

[0011] Preferably, the fan blade is composed of a plurality of segments; the segments are connected by independent second springs.

[0012] Preferably, the annular plate divides the annular groove into an upper cavity and a lower cavity; the upper cavity is communicated with the position near the center of the upper surface of the grinding disc through a one-way air inlet hole, and the upper cavity is communicated with the arc-shaped outer wall of the grinding disc through a one-way air outlet hole.

[0013] Preferably, a circular groove is arranged on the upper groove wall of the annular groove; the circular groove penetrates upward and is threadedly connected with a second bolt; a circular block corresponding to the circular groove is rotatably connected to the upper surface of the annular plate; the circular block and the second bolt are connected by a third tension spring.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. In the present invention, the rotation of the grinding disc drives the grinding block at the end of the tool holder to uniformly contact the inner wall of the valve body, so that the inner wall of the valve body is ground under a uniformly stressed state, and the grinding efficiency and safety are improved. At the same time, it is applicable to the inner diameters of valve bodies with different diameters, and has a wide application range.

[0016] 2. In the present invention, by changing the position of the first bolt in the annular groove, the lower limit position of the annular plate in the annular groove can be adjusted, and further the grinding thickness of the grinding block on the inner wall of the valve body can be adjusted to meet different grinding requirements of the valve body.

[0017] 3. When the tool holder of the present invention is locked, the grinding block will not be thrown out with the increase of centrifugal force, realizing the locking and disabling of the grinding block; the closer the plug is to the bottom of the internal thread groove, the more the number of locked and disabled grinding blocks, and vice versa, so that the number of enabled grinding blocks is controllable; the number of grinding blocks is adjustable, which can be adjusted according to the size and material of the valve body, improving the grinding efficiency and quality, and reducing costs and losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the drawings and embodiments.

[0019] Figure 1 is the grinding schematic diagram of the present invention;

[0020] Figure 2 is the three-dimensional view of the present invention;

[0021] Figure 3 is the three-dimensional view of the grinding disc and the grinding block in the present invention;

[0022] Figure 4 is Figure 3 the three-dimensional view from another angle in;

[0023] Figure 5 is the cross-sectional view of the present invention;

[0024] Figure 6 is Figure 5 the enlarged view at A in;

[0025] Figure 7 are the three-dimensional views of the tool holder and the tool seat in the present invention;

[0026] Figure 8 is the cross-sectional view of the blade groove in the present invention;

[0027] Figure 9 is Figure 8 the cross-sectional view at B-B in

[0028] In the figure: grinding table 1, three-coordinate arm 11, motor 12, electric push rod 13, clamping plate 14, grid groove 15, grinding disc 2, telescopic groove 21, first tension spring 22, annular groove 23, first liquid hole 231, upper cavity 232, lower cavity 233, one-way air inlet hole 234, one-way air outlet hole 235, first bolt 24, groove 25, internal thread groove 26, second liquid hole 261, reinforcing groove 27, round groove 28, second bolt 29, tool seat 3, threaded hole 31, card slot 32, anti-blocking block 33, first spring 34, linkage groove 35, linkage block 36, linkage rod 37, tool holder 4, threaded joint 41, grinding block 42, blade groove 43, fan blade 44, divided piece 441, second spring 45, annular plate 5, round block 51, third tension spring 52, clamping block 6, second tension spring 61, plug 7. Detailed implementation manners

[0029] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0030] As Figures 1 to 9 shown, the present invention includes the following embodiments:

[0031] Embodiment 1: A mechanical valve body forging grinding device, including a grinding table 1 and a three-coordinate arm 11 on the upper surface of the grinding table 1; the three-coordinate arm 11 can drive the motor 12 with an output shaft to move to any point in three-dimensional directions; the upper surface of the grinding table 1 is symmetrically provided with electric push rods 13; the output ends of the electric push rods 13 are fixedly connected with clamping plates 14; the output shaft of the motor 12 is fixedly connected with a grinding disc 2; the arc-shaped outer wall of the grinding disc 2 is uniformly provided with telescopic grooves 21 with a square cross-section; the bottom of the telescopic groove 21 is connected to a tool seat 3 through a first tension spring 22; the threaded hole 31 on one side of the tool seat 3 away from the first tension spring 22 is threadedly connected to the threaded joint 41 at one end of a tool holder 4; the other end of the tool holder 4 is fixedly connected with a grinding block 42; both the tool holder 4 and the tool seat 3 are slidably connected to the telescopic groove 21.

[0032] Before grinding the valve body forging (hereinafter referred to as the valve body), first place the inner wall opening of the valve body to be ground facing upwards and stand it upright at the center of the grinding table 1. Subsequently, start the grinding table 1 to drive the electric push rod 13 to work. The electric push rod 13 can be replaced with components such as a hydraulic cylinder. During the elongation of the electric push rod 13, it will drive the clamping plate 14 to move. When the two clamping plates 14 approach each other, they will clamp the outer wall of the valve body to achieve fixation before grinding the valve body. To improve the clamping and positioning effects, electric push rods 13 can also be selectively installed in all four directions of the valve body. Then, control the three-coordinate arm 11 to move in the x-y-z three directions until the central axis of the grinding disc 2 coincides with the central axis of the inner wall of the valve body. Then, control the grinding disc 2 to move down and enter the inner wall of the valve body. Start the motor 12 to drive the grinding disc 2 to rotate. During the rotation of the grinding disc 2, it will drive multiple tool holders 3, tool shanks 4, and grinding blocks 42 to rotate synchronously. Under the action of centrifugal force, the tool holders 3, tool shanks 4, and grinding blocks 42 will move away from the center of the grinding disc 2. The tool holders 3 and tool shanks 4 will overcome the pulling force of the first tension spring 22 and slide along the telescopic groove 21. The tool shank 4 will drive the grinding block 42 to contact the inner wall of the valve body. The grinding blocks 42 on the arc-shaped outer wall of the grinding disc 2 are evenly distributed. The extrusion forces of the evenly distributed grinding blocks 42 contacting the inner wall of the valve body are evenly distributed, making the grinding extrusion force on the inner wall of the valve body balanced and not biased towards a certain place, making the valve body clamped more stably. When the grinding block 42 remains in contact with the inner wall of the valve body, the grinding block 42 will move with the rotation of the grinding disc 2, thereby realizing simultaneous grinding of the inner wall of the valve body by multiple grinding blocks 42, with higher grinding efficiency. During the grinding process, the valve body does not need to rotate, and only the internal grinding disc 2 rotates, making the grinding safer and more stable. In addition, for the inner walls of some valve bodies with poor regularity, such as the situation where there are protruding burrs on the inner wall of the valve body, the grinding block 42 can also perform grinding step by step to avoid situations such as "collision of the tool" caused by hard contact grinding, making the grinding more stable. After completing the grinding at the same height of the inner wall of the valve body, control the grinding disc 2 to move down until the inner wall of the valve body is completely ground. The grinding force and efficiency increase with the increase in the rotation speed of the motor 12. After grinding is completed, stop the rotation of the motor 12, control the grinding disc 2 to move out of the inner wall of the valve body. The centrifugal forces of the grinding block 42, tool shank 4, and tool holder 3 will decrease, and the first tension spring 22 will pull the tool holder 3 to drive the tool shank 4 to retract into the telescopic groove 21, and the grinding block 42 will also contact the arc-shaped outer wall of the grinding disc 2. In the case of re-grinding, control the grinding disc 2 to rotate again. When the grinding block 42 is thrown out by centrifugal force, it is applicable to grinding the inner walls of valve bodies with different diameters, with a wide grinding range. Finally, shorten the electric push rod 13 to drive the clamping plate 14 to disengage from the valve body, so that the valve body is released from clamping, and the valve body can be removed from the grinding table 1.After the grinding block 42 has been used for a period of time, it needs to be replaced. Simply pull the tool handle 4 and the tool holder 3 to overcome the first tension spring 22 and slide out along the telescopic groove 21. Then, turn the tool handle 4 to unscrew the tool handle 4 from the tool holder 3. Replace the new tool handle 4 and the grinding block 42. Release the grinding block 42 and the tool handle 4, and the tool handle 4 will retract into the telescopic groove 21 under the pull of the first tension spring 22 inside the tool holder 3;

[0033] In the present invention, the rotation of the grinding disc 2 drives the grinding block 42 at the end of the tool handle 4 to evenly contact the inner wall of the valve body, so that the inner wall of the valve body is ground under a state of uniform force, and the grinding efficiency and safety are improved. At the same time, it is applicable to the inner diameters of valve bodies with different diameters, and has a wide range of applications.

[0034] Embodiment 2: The tool holder 3 is slidably and sealingly connected to the telescopic groove 21; an annular groove 23 is provided inside the grinding disc 2 and below the telescopic groove 21; the annular groove 23 is slidably and sealingly connected to an annular plate 5 up and down; the lower inner wall of the annular groove 23 penetrates downward and is threadedly and sealingly connected to a first bolt 24; the lower inner wall of the annular groove 23 communicates with the bottom of the corresponding telescopic groove 21 through a first liquid hole 231.

[0035] Before using the grinding disc 2 to grind the inner wall of the valve body, first turn the first bolt 24 according to the grinding diameter or grinding amount of the inner wall of the valve body. The annular plate 5 divides the annular groove 23 into an upper cavity 232 and a lower cavity 233. The lower cavity 233 is filled with a liquid medium. The first bolt 24 is thread-sealedly connected to the lower inner wall of the annular groove 23, so the liquid medium in the lower cavity 233 will not leak. When the first bolt 24 is turned upward, the distance that the annular plate 5 moves downward in the annular groove 23 is shortened, and the amount of the liquid medium in the lower cavity 233 flowing into the expansion groove 21 along the first liquid hole 231 decreases. In this way, the maximum distance of the plurality of grinding blocks 42 from the center of the grinding disc 2 decreases, so that the grinding diameter is reduced and the grinding amount is decreased; when the first bolt 24 is turned downward, the downward movement distance of the annular plate 5 in the annular groove 23 increases, and the amount of the liquid medium in the lower cavity 233 flowing into the expansion groove 21 along the first liquid hole increases. In this way, the maximum distance of the plurality of grinding blocks 42 from the center of the grinding disc 2 increases, so that the grinding diameter is enlarged and the grinding amount is increased; after the first bolt 24 is turned, the grinding disc 2 is put into use. When the grinding disc 2 is located inside the valve body and rotates, the grinding block 42 drives the tool holder 4 and the tool rest 3 to slide along the expansion groove 21 under the action of centrifugal force. The first tension spring 22 is pulled, and the space in the expansion groove 21 expands to form a negative pressure. The liquid medium in the lower cavity 233 will flow into the expansion groove 21 along the first liquid hole 231 under the action of the negative pressure. The plurality of expansion grooves 21 are communicated through the first liquid hole 231 and the lower cavity 233. In this way, the distances of the plurality of grinding blocks 42 away from the center of the grinding disc 2 under the action of centrifugal force are kept the same. After the liquid medium in the lower cavity 233 of the annular plate 5 in the annular groove 23 flows away, it will move downward. After the grinding block 42 grinds the inner wall of the valve body to a qualified amount, the annular plate 5 in the annular groove 23 moves downward and contacts the upper end of the first bolt 24. Under the limitation of the first bolt 24, the annular plate 5 cannot continue to move downward, and the expansion groove 21 cannot continue to suck the liquid medium in the lower cavity 233. In this way, the outward movement positions of the tool rest 3 and the tool holder 4 in the expansion groove 21 are limited, and the maximum grinding amount of the grinding block 42 is limited, so as to avoid over-grinding; in this embodiment, by changing the position of the first bolt 24 in the annular groove 23, the downward limit position of the annular plate 5 in the annular groove 23 can be adjusted, and further the grinding thickness of the grinding block 42 on the inner wall of the valve body can be adjusted to meet the different grinding requirements of the valve body.

[0036] Embodiment 3: A clamping groove 32 is provided on the upper surface of the tool holder 3; a groove 25 corresponding to the clamping groove 32 is provided on the upper inner wall of the telescopic groove 21; a clamping block 6 is slidably and sealingly connected in the groove 25; the clamping block 6 is connected to the bottom of the groove 25 by a second tension spring 61; the pulling forces of the plurality of second tension springs 61 are different; an internal thread groove 26 is provided on the lower surface of the grinding disc 2; a plug 7 is threadedly and sealingly connected to the internal thread groove 26; a second liquid hole 261 communicates between the upper end of the internal thread groove 26 and the bottom of the groove 25.

[0037] In this embodiment, the plurality of second tension springs 61 are centrosymmetric about the central axis of the grinding disc 2; the pulling forces of two symmetric second tension springs 61 are the same.

[0038] The number of the grinding blocks 42 is adjustable and can be adjusted according to the size and material of the valve body, so as to improve the grinding efficiency and quality, and also reduce the cost and loss; therefore, before the grinding disc 2 and the grinding blocks 42 are put into use, turn the plug 7 according to the enabling requirement of the grinding blocks 42. During the upward movement of the plug 7 when it is turned, the plug 7 will squeeze the liquid medium in the internal thread groove 26, and the liquid in the internal thread groove 26 will be pressed and flow into the groove 25 along the second liquid hole 261, so that the liquid medium in the groove 25 increases. For some second tension springs 61 with larger pulling forces, the connected clamping block 6 will not be driven to move. For some second tension springs 61 with smaller pulling forces, the corresponding clamping block 6 will be pressed to overcome the second tension spring 61 and enter the clamping groove 32 along the groove 25 to lock the corresponding tool holder 3. When the tool holder 3 is locked, the grinding blocks 42 will not be thrown out as the centrifugal force increases, realizing the locking and disabling of the grinding blocks 42; the closer the plug 7 is to the bottom of the internal thread groove 26, the more the number of the grinding blocks 42 locked and disabled, and vice versa, so that the enabled number of the grinding blocks 42 is controllable; further, the pulling forces of two centrosymmetric second tension springs 61 are the same, so that the two centrosymmetric second tension springs 61 are enabled and disabled at the same time, so that the grinding blocks 42 around the grinding disc 2 are balanced in force after rotation, improving the stability of the grinding disc 2 driving the grinding blocks 42 for grinding.

[0039] Embodiment 4: A blocking prevention block 33 is slidably connected to the inner wall of the clamping groove 32; the blocking prevention block 33 is connected to the bottom of the clamping groove 32 by a first spring 34; the blocking prevention block 33 is flush with the notch of the clamping groove 32 under the action of the first spring 34; a linkage groove 35 symmetric to the clamping groove 32 is provided on the lower surface of the tool holder 3; a linkage block 36 is slidably connected in the linkage groove 35; the bottom of the clamping groove 32 and the bottom of the linkage groove 35 are penetrated and movably connected by a linkage rod 37; the blocking prevention block 33 is connected to the linkage block 36 by the linkage rod 37; a strengthening groove 27 corresponding to the linkage groove 35 is provided on the lower inner wall of the telescopic groove 21.

[0040] During the process that the clamping block 6 in the groove 25 is pressed into the clamping groove 32, the clamping block 6 will move close to the bottom of the clamping groove 32 against the elastic force of the first spring 34. The clamping block 6 will drive the linkage block 36 away from the bottom of the linkage groove 35 through the linkage rod 37, and the linkage block 36 will enter the corresponding strengthening groove 27. In this way, under the dual action of the clamping block 6 being clamped into the clamping groove 32 and the linkage block 36 being clamped into the strengthening groove 27, the tool holder 3 and the grinding block 42 are locked more stably; during the process that the clamping block 6 is removed from the clamping groove 32, the first spring 34 will push the anti-blocking block 33 upward, and the anti-blocking block 33 will drive the linkage block 36 to move out of the strengthening groove 27 through the linkage rod 37, and the linkage block 36 will return to the linkage groove 35, unlocking the tool holder 3 and the grinding block 42; enabling the tool holder 3 and the tool handle 4 to move away from the center of the grinding disc 2 under the action of centrifugal force.

[0041] Embodiment 5: A grid groove 15 is arranged on the upper surface of the grinding table 1; a blade groove 43 is arranged on the outer wall of the tool handle 4 in an inclined manner facing outward; a sector blade 44 is slidably connected in the blade groove 43; the sector blade 44 is connected to the bottom of the blade groove 43 through a second spring 45.

[0042] In this embodiment, the sector blade 44 is composed of a plurality of segmented blades 441; the segmented blades 441 are connected by independent second springs 45.

[0043] During the rotation of the grinding disc 2, the tool holder 3, the tool handle 4 and the grinding block 42 move away from the center of the grinding disc 2 under the action of centrifugal force. After the tool handle 4 is exposed from the telescopic groove 21, the second spring 45 will push the sector blade 44 to extend along the blade groove 43. The sector blades 44 are arranged on both the windward side and the leeward side of the tool handle 4. Further, the sector blade 44 is composed of a plurality of independent segmented blades 441. After a part of the tool handle 4 extends out of the telescopic groove 21, the corresponding number of segmented blades 441 will also be pushed out of the blade groove 43. One side of the tool handle 4 extends the segmented blade 441 in an inclined manner downward, and the other side extends the segmented blade 441 in an inclined manner upward. Thus, the segmented blade 441 is equivalent to a fan blade. With the rotation of the grinding disc 2, the grinding disc 2 drives the segmented blade 441 to disturb the surrounding air flow to move downward, and the air flow will drive the debris ground by the grinding block 42 to flow downward. The bottom of the valve body falls on the grid groove 15 on the upper surface of the grinding table 1, enabling the air flow from top to bottom to flow out along the grid groove 15; after the grinding disc 2 stops rotating, the tool handle 4 will retract into the telescopic groove 21 under the action of the pulling force. Since the end of the segmented blade 441 close to the bottom of the blade groove 43 is closer to the center of the grinding disc 2 than the end far from the bottom of the blade groove 43, the segmented blade 441 will overcome the second spring 45 and retract into the blade groove 43 for storage under the extrusion of the telescopic groove 21 opening, enabling the segmented blade 441 to retract into the telescopic groove 21 along with the tool handle 4; when the debris around the grinding block 42 is taken away in time, the grinding effect is improved.

[0044] Embodiment 6: The annular plate 5 divides the annular groove 23 into an upper cavity 232 and a lower cavity 233; the upper cavity 232 is communicated with the upper surface of the grinding disc 2 near the center through a one-way air inlet hole 234, and the upper cavity 232 is communicated with the arc-shaped outer wall of the grinding disc 2 through a one-way air outlet hole 235.

[0045] During the rotation of the grinding disc 2, the tool holder 4 extends out of the telescopic groove 21, and the annular plate 5 moves downward, causing the space of the upper cavity 232 to expand to form a negative pressure. The outside air enters the upper cavity 232 along the one-way air inlet hole 234 for gas replenishment. During the process of the tool holder 4 retracting into the telescopic groove 21, the annular plate 5 moves upward to squeeze the upper cavity 232, and the gas in the upper cavity 232 is discharged along the one-way air outlet hole 235 and impacts the segment 441 and the outer wall of the tool holder 4 to reduce the influence of debris on the retraction of the tool holder 4 into the telescopic groove 21.

[0046] Embodiment 7: A circular groove 28 is provided on the upper groove wall of the annular groove 23; the circular groove 28 penetrates upward and is threadedly connected with a second bolt 29; a circular block 51 corresponding to the circular groove 28 is rotatably connected to the upper surface of the annular plate 5; the circular block 51 and the second bolt 29 are connected by a third tension spring 52.

[0047] Turning the second bolt 29 drives the third tension spring 52 and the circular block 51 to rotate. During the upward movement of the second bolt 29, the pulling force of the annular plate 5 pulled by the third tension spring 52 increases, so that the resistance of the annular plate 5 moving downward becomes larger. On the contrary, during the downward movement of the second bolt 29, the pulling force of the annular plate 5 pulled by the third tension spring 52 decreases, so that the resistance of the annular plate 5 moving downward becomes smaller. By controlling the resistance of the annular plate 5 moving downward, the sensitivity and degree of the tool holder 4 extending out of the telescopic groove 21 can be adjusted at the same rotation speed of the grinding disc 2. Furthermore, at a low rotation speed of the grinding disc 2, the tool holder 4 will also extend out of the telescopic groove 21 for grinding, making the extension of the tool holder 4 more sensitive. In addition, at a high rotation speed of the grinding disc 2, it is difficult for the tool holder 4 to extend out of the telescopic groove 21, avoiding excessive extension of the tool holder 4 driving the grinding block 42 and resulting in excessive grinding force, thereby realizing the protection of the grinding surface and the grinding block 42; thus meeting different grinding requirements and improving the grinding accuracy and versatility.

[0048] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the attached Figure 1The orientation or positional relationship shown 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 specific orientation, be constructed and operate in a specific orientation, and thus cannot be construed as a limitation on the protection scope of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0049] The basic principles, main features, and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A grinding device for a mechanical valve body forging, comprising a grinding table and a three-coordinate arm on the upper surface of the grinding table; the three-coordinate arm can drive the motor of the output shaft to move to any point in three-dimensional directions; characterized in that: Electric push rods are symmetrically arranged on the upper surface of the grinding table; the output ends of the electric push rods are fixedly connected with clamping plates; the output shaft of the motor is fixedly connected with a grinding disc; square-section telescopic grooves are evenly arranged on the arc-shaped outer wall of the grinding disc; the bottom of the telescopic groove is connected with a tool holder through a first tension spring; the threaded hole on the side of the tool holder away from the first tension spring is threadedly connected with the threaded joint at one end of the tool handle; the other end of the tool handle is fixedly connected with a grinding block; both the tool handle and the tool holder are slidably connected with the telescopic groove.

2. The mechanical valve body forging grinding device according to claim 1, wherein: The tool holder is slidably and hermetically connected with the telescopic groove; an annular groove is arranged inside the grinding disc and below the telescopic groove; an annular plate is slidably and hermetically connected with the annular groove up and down; the lower inner wall of the annular groove penetrates downward and is threadedly and hermetically connected with a first bolt; the lower inner wall of the annular groove is communicated with the bottom of the corresponding telescopic groove through a first liquid hole.

3. The grinding device for a mechanical valve body forging according to claim 1, characterized in that: A clamping groove is arranged on the upper surface of the tool holder; a groove corresponding to the clamping groove is arranged on the upper inner wall of the telescopic groove; a clamping block is slidably and hermetically connected in the groove; the clamping block is connected with the bottom of the groove through a second tension spring; the pulling forces of the plurality of second tension springs are different; an internal thread groove is arranged on the lower surface of the grinding disc; a plug is threadedly and hermetically connected with the internal thread groove; the upper end of the internal thread groove is communicated with the bottom of the groove through a second liquid hole.

4. A grinding device for a mechanical valve body forging according to claim 3, characterized in that: The plurality of second tension springs are centrosymmetric about the central axis of the grinding disc; the pulling forces of two relatively symmetric second tension springs are the same.

5. A grinding device for a mechanical valve body forging according to claim 3, characterized in that: An anti-blocking block is slidably connected to the inner wall of the clamping groove; the anti-blocking block is connected with the bottom of the clamping groove through a first spring; the anti-blocking block is flush with the notch of the clamping groove under the action of the first spring; a linkage groove symmetric to the clamping groove is arranged on the lower surface of the tool holder; a linkage block is slidably connected in the linkage groove; the bottom of the clamping groove and the bottom of the linkage groove penetrate and are movably connected with a linkage rod; the anti-blocking block and the linkage block are connected through the linkage rod; a strengthening groove corresponding to the linkage groove is arranged on the lower inner wall of the telescopic groove.

6. The grinding device for a mechanical valve body forging according to claim 2, characterized in that: A grid groove is arranged on the upper surface of the grinding table; a blade groove is obliquely arranged outward on the outer wall of the tool handle; a fan blade is slidably connected in the blade groove; the fan blade is connected with the bottom of the blade groove through a second spring.

7. A grinding device for a mechanical valve body forging according to claim 6, characterized in that: The fan blade is composed of a plurality of segments; the segments are connected by independent second springs.

8. The grinding device for a mechanical valve body forging according to claim 6, characterized in that: The annular plate divides the annular groove into an upper cavity and a lower cavity; the upper cavity is communicated with the position near the center of the upper surface of the grinding disc through a one-way air inlet hole, and the upper cavity is communicated with the arc-shaped outer wall of the grinding disc through a one-way air outlet hole.

9. A grinding device for a mechanical valve body forging according to claim 2, characterized in that: A round groove is arranged on the upper groove wall of the annular groove; the round groove penetrates upward and is threadedly connected with a second bolt; a round block corresponding to the round groove is rotatably connected to the upper surface of the annular plate; the round block is connected with the second bolt through a third tension spring.

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