Ball valve grinding device with error compensation function

Abstract

The utility model relates to ball valve grinding equipment technical field, especially a ball valve grinding processing equipment with error compensation function. Its technical scheme includes base, collection box, hydraulic rod no.

Description

Technical Field

[0001] This utility model relates to the technical field of ball valve grinding equipment, and in particular to a ball valve grinding processing equipment with error compensation function. Background Technology

[0002] A ball valve is a type of valve that uses a ball as the closing element, primarily used to control the flow of fluids or regulate their flow rate. Grinding is a crucial process for improving the core performance of ball valves. If there are machining defects such as scratches, bumps, or burrs on the contact surfaces between the ball and the valve seat, it can lead to fluid leakage. Grinding can eliminate these defects, achieving a micron-level fit precision on the sealing surface. The grinding power is provided by a motor that drives the grinding disc, grinding head, or workpiece to rotate.

[0003] To avoid grinding errors, a laser displacement sensor array is installed to scan the radial profile of the ball valve assembly's sealing surface in real time, collecting shape error data such as roundness and flatness. Simultaneously, a grating ruler positioning system is installed to provide real-time feedback on the spindle rotation angle and the grinding head's feed position. However, grinding generates a large amount of suspended dust, which scatters the laser beam, causing instability in the intensity of the reflected light received by the sensor. Furthermore, dust entering the gap between the grating ruler's reading head and the scale can scratch the grating stripes, leading to signal jumps or distortions and affecting the use of the error compensation device. Therefore, we propose a ball valve grinding processing equipment with error compensation function to solve these existing problems. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a ball valve grinding and processing equipment with error compensation function.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a ball valve grinding and processing equipment with error compensation function, comprising a base, a collection box, a hydraulic rod, a motor, and a grating ruler. The upper end of the base is provided with the hydraulic rod, the telescopic end of which is provided with a movable frame. The upper end of the movable frame is provided with a motor, the output end of which is provided with an output shaft. One end of the output shaft is provided with a grinding wheel. The upper end of the base is also provided with a ring frame, on which symmetrically distributed laser displacement sensors are mounted. One end of the base is provided with a collection box, one end of which is provided with a fan. A suction hood facing the grinding wheel is provided on one side of the collection box. Grating rulers are provided at both the motor output end and the upper end of the base.

[0006] Preferably, the lower end of the movable frame is provided with symmetrically distributed sliders, and the upper end of the base is provided with symmetrically distributed guide rails that are slidably mounted to the sliders. The movable frame is guided by the sliders sliding on the outer wall of the guide rails.

[0007] Preferably, the upper end of the movable frame is provided with symmetrically distributed ring seats, and the outer wall of the motor output shaft is fitted with a rotating ring that is rotatably installed inside the ring seats.

[0008] Preferably, both the inner wall of the ring seat and the outer wall of the rotating ring are provided with annular grooves. A ring-shaped array of balls is rotatably mounted inside the grooves, and a retainer connected to the ring seat is rotatably mounted between the balls. The outer wall of the output shaft is supported by the ring-shaped array of balls that are rolled inside the ring seat, thereby improving the rotational stability of the motor output shaft.

[0009] Preferably, the upper end of the base is provided with symmetrically distributed hydraulic rods two, and the telescopic end of the hydraulic rods two is provided with a clamping block. The hydraulic rods two drive the clamping block to clamp the ball valve assembly.

[0010] Preferably, a pressure sensor is provided at one piston end of the hydraulic rod. The pressure sensor detects the oil pressure supplied to the piston end, and then adjusts the travel of the extension and retraction end of the hydraulic rod.

[0011] Preferably, the blower's suction end is equipped with a negative pressure pipe that penetrates the collection box. A filter screen is installed at one end of the negative pressure pipe, and a corresponding suction pipe, connected to the suction hood, is installed at one end of the collection box. The filter screen intercepts the suctioned dust, preventing it from entering the blower. The suction force of the negative pressure pipe, through the suction pipe and suction hood, effectively acts on the grinding wheel's processing space.

[0012] Preferably, the lower end of the collection box is provided with an ash hopper, and the lower end of the ash hopper is provided with a discharge pipe controlled by a valve. The ash hopper collects dust and discharges it through the discharge pipe, the valve controlling the opening and closing of the discharge pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model uses a motor-driven output shaft to rotate, which in turn drives the grinding wheel to rotate at high speed. The hydraulic rod outputs pressure to grind the ball valve assembly. During this process, two sets of high-precision laser probes are arranged in a 120° ring around the outside of the grinding head to scan the radial contour of the sealing surface of the ball valve assembly in real time and collect shape errors. The grating ruler positioning structure is installed on the motor output shaft and one side of the guide rail to provide real-time feedback on the spindle rotation angle and the grinding head feed position. At the same time, to avoid dust affecting the accuracy, a negative pressure structure is set on one side of the grinding equipment to handle the generated dust and prevent suspended dust from affecting the stability of the error compensation device. Attached Figure Description

[0014] Figure 1 This is a front-view three-dimensional structural diagram of the present invention; Figure 2 This is a top-view three-dimensional structural diagram of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the collection box of this utility model; Figure 4 This is a front-view three-dimensional structural diagram of the motor of this utility model; Figure 5 This is a rear-view three-dimensional structural diagram of the motor of this utility model.

[0015] Reference numerals: 1. Base; 2. Collection box; 3. Suction hood; 4. Hydraulic rod one; 5. Motor; 6. Ring frame; 7. Laser displacement sensor; 8. Hydraulic rod two; 9. Holder; 10. Ash hopper; 11. Fan; 12. Negative pressure pipe; 13. Filter screen; 14. Suction pipe; 15. Slider; 16. Output shaft; 17. Grinding wheel; 18. Ring seat; 19. Pressure sensor; 20. Rotating ring; 21. Guide rail; 22. Grating ruler; 23. Moving frame; 24. Ball bearing. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figures 1-5 As shown, the present invention proposes a ball valve grinding and processing equipment with error compensation function, including a base 1, a collection box 2, a hydraulic rod 4, a motor 5, and a grating ruler 22. The hydraulic rod 4 is provided on the upper end of the base 1, and a movable frame 23 is provided on the telescopic end of the hydraulic rod 4. The motor 5 is provided on the upper end of the movable frame 23, and an output shaft 16 is provided on the output end of the motor 5. A grinding wheel 17 is provided on one end of the output shaft 16. A ring frame 6 is also provided on the upper end of the base 1. A laser displacement sensor 7 is symmetrically distributed on the ring frame 6. The collection box 2 is provided on one end of the base 1, and a fan 11 is provided on one end of the collection box 2. A suction cover 3 facing the grinding wheel 17 is provided on one side of the collection box 2. A grating ruler 22 is provided on both the output end of the motor 5 and the upper end of the base 1.

[0018] The lower end of the movable frame 23 is provided with symmetrically distributed sliders 15, and the upper end of the base 1 is provided with symmetrically distributed guide rails 21 that slide in cooperation with the sliders 15.

[0019] The upper end of the movable frame 23 is provided with symmetrically distributed ring seats 18, and the outer wall of the output shaft 16 of the motor 5 is fitted with a rotating ring 20 which is rotatably installed inside the ring seat 18.

[0020] Both the inner wall of the ring seat 18 and the outer wall of the rotating ring 20 are provided with annular grooves. Inside the grooves, balls 24 arranged in an annular array are rotatably installed. Between the balls 24, a retainer 9 connected to the ring seat 18 is rotatably installed.

[0021] The upper end of the base 1 is provided with symmetrically distributed hydraulic rods 2 8, and the telescopic end of the hydraulic rods 2 8 is provided with clamping blocks.

[0022] A pressure sensor 19 is installed at the piston end of the hydraulic rod 4.

[0023] The suction end of the blower 11 is provided with a negative pressure pipe 12 that passes through the collection box 2. A filter screen 13 is provided at one end of the negative pressure pipe 12. A suction pipe 14 corresponding to the negative pressure pipe 12 and connected to the suction hood 3 is provided at one end of the collection box 2.

[0024] The lower end of the collection box 2 is equipped with an ash hopper 10, and the lower end of the ash hopper 10 is equipped with a discharge pipe controlled by a valve.

[0025] Based on the implementation steps of Example 1: It is worth noting that the grating ruler 22 mainly includes a scale grating, a reading head, and a signal processing unit. The grating ruler 22 needs to be installed on the output shaft 16 of the grinding motor 5 and the feed slider 15, respectively. During installation, the mounting surface of the guide rail 21 is processed, and the straightness of the guide rail 21 is calibrated with a level. The scale grating is pasted to the side of the guide rail 21 with epoxy resin adhesive. The parallelism between the scale and the direction of movement of the guide rail 21 is calibrated with a dial indicator to ensure that the reading head does not contact the edge of the scale during movement. The reading head is fixed on the moving frame 23 by a bracket and connected to a signal cable. The shielding layer is grounded at one end. A 50mm redundancy is reserved when fixing the cable to avoid pulling during movement. At the same time, a circular grating disk is installed on the spindle end cover and rigidly connected to the output shaft 16 of the motor 5 through a shrink sleeve. The reading head is fixed on the spindle housing, and its axial distance and radial concentricity with the grating disk are adjusted to ensure signal stability during rotation. A flexible coupling is used to connect the grating disk and the output shaft 16 of the motor 5 to compensate for installation coaxiality errors.

[0026] Dust particles scatter the laser beam, causing instability in the intensity of reflected light received by the sensor, and even signal loss. For example, when the dust concentration is high, the laser beam energy attenuates, and the detection resolution, originally 0.1μm, may drop to 1μm, making it impossible to accurately identify minute protrusions or depressions on the sealing surface. Dust adhering to the lens surface of the laser probe forms irregular obstructions, causing errors in the scanning contour. If not cleaned for a long time, dirt will accumulate on the lens surface, potentially causing the sensor to completely fail, requiring downtime for maintenance and affecting production efficiency. Dust forms a dielectric interference layer between the sensor and the workpiece, altering the laser propagation path and causing systematic deviations in distance measurements. For example, when the actual distance is 10mm, the measurement deviation can reach 0.01mm, directly affecting the shape. The accuracy of error compensation is affected by dust entering the gap between the reading head and the scale of the grating ruler 22, which can scratch the grating stripes and cause signal jumps or distortions. For example, a 0.05mm dust particle may cause miscounting of the grating signal, increasing the feedback error of the spindle rotation angle or feed position to ±5μm, far exceeding the original ±0.5μm accuracy standard. If dust accumulates on the mounting base of the guide rail 21 and the grating ruler 22, it will cause the reading head to slide poorly, resulting in positioning lag and preventing the position compensation command from being executed in time, thus compromising the real-time performance of the closed-loop control. A suction hood 3 is installed outside the laser sensor group. The suction force of the suction hood 3 is away from the laser displacement sensor 7, forming a local clean area. At the same time, the negative pressure will draw the dust away from the area around the reading head to prevent dust from settling.

[0027] The slider 15 is made of high-strength ductile iron, characterized by high hardness and strong wear resistance. Its clearance with the guide rail 21 is controlled within 0.01-0.03mm. The guide rail 21 is made of alloy structural steel and has undergone quenching treatment. The combination of these two materials not only ensures smooth sliding of the moving frame 23 but also withstands the radial force generated during grinding, ensuring feed accuracy. The ring seat 18 and rotating ring 20 are made of aerospace aluminum alloy, which is lightweight and has good rigidity. The balls 24 are made of bearing steel, and the cage 9 is made of polytetrafluoroethylene (PTFE), which has self-lubricating properties. The rolling of the balls 24 within the grooves reduces the coefficient of friction of the motor 5 output shaft 16. The hydraulic rod 8 uses a 304 stainless steel cylinder body, which is corrosion-resistant and pressure-resistant. The contact surface of the clamping block is inlaid with polyetheretherketone (PEEK) material. The pressure sensor 19 is... The diffused silicon pressure sensor 19 can monitor the output pressure of the hydraulic rod 4 in real time and automatically adjust it in conjunction with the grinding stage to avoid workpiece deformation caused by excessive pressure or low grinding efficiency caused by insufficient pressure. The filter screen 13 is a sintered 316L stainless steel mesh with a pore size of 5μm, which can be repeatedly cleaned. The suction hood 3 is made of ABS engineering plastic. After the equipment is started, the hydraulic rod 8 drives the clamping block to clamp the ball valve assembly to ensure that the coaxiality between the workpiece axis and the grinding wheel 17 axis is ≤0.02mm. The motor 5 drives the grinding wheel 17 to rotate through the output shaft 16. The output shaft 16 is supported by the rolling balls 24 in the ring seat 18, which improves the rotation stability. The hydraulic rod 4 pushes the moving frame 23 to feed. The pressure sensor 19 monitors the grinding pressure in real time and automatically adjusts it in conjunction with the grinding stage.

[0028] During the grinding process, the laser displacement sensor 7 on the ring frame 6 scans the sealing surface in real time, and the grating ruler 22 provides feedback on the position information. The data is transmitted to the control system to calculate the error. At the same time, the fan 11 starts, and a negative pressure is formed in the grinding area through the suction hood 3. The dust enters the collection box 2 through the suction pipe 14. After being intercepted by the stainless steel filter screen 13, the clean airflow is discharged to avoid dust interference with the sensor. If an error is detected, the control system drives the hydraulic rod 4 to fine-tune the feed amount, or compensates for the speed of the motor 5 to ensure that the sealing surface accuracy reaches the micron level. The dust generated during grinding is temporarily stored in the ash hopper 10 and is cleaned periodically through the discharge pipe. The entire process ensures the fitting accuracy of the ball valve sealing surface.

[0029] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A ball valve grinding and processing equipment with error compensation function, comprising a base (1), a collection box (2), a hydraulic rod (4), a motor (5), and a grating ruler (22), characterized in that: The upper end of the base (1) is provided with a hydraulic rod (4), the telescopic end of the hydraulic rod (4) is provided with a moving frame (23), the upper end of the moving frame (23) is provided with a motor (5), the output end of the motor (5) is provided with an output shaft (16), one end of the output shaft (16) is provided with a grinding wheel (17), the upper end of the base (1) is also provided with a ring frame (6), the ring frame (6) is provided with symmetrically distributed laser displacement sensors, one end of the base (1) is provided with a collection box (2), one end of the collection box (2) is provided with a fan (11), one side of the collection box (2) is provided with a suction cover (3) facing the grinding wheel (17), the output end of the motor (5) and the upper end of the base (1) are both provided with a grating ruler (22).

2. The ball valve grinding and processing equipment with error compensation function according to claim 1, characterized in that: The lower end of the mobile frame (23) is provided with symmetrically distributed sliders (15), and the upper end of the base (1) is provided with symmetrically distributed guide rails (21) that slide in cooperation with the sliders (15).

3. The ball valve grinding and processing equipment with error compensation function according to claim 1, characterized in that: The upper end of the mobile frame (23) is provided with symmetrically distributed ring seats (18), and the outer wall of the output shaft (16) of the motor (5) is fitted with a rotating ring (20) that is rotatably installed inside the ring seat (18).

4. The ball valve grinding and processing equipment with error compensation function according to claim 3, characterized in that: The inner wall of the ring seat (18) and the outer wall of the rotating ring (20) are both provided with annular grooves. Balls (24) arranged in annular array are rotatably installed inside the grooves. A retainer (9) connected to the ring seat (18) is rotatably installed between the balls (24).

5. The ball valve grinding and processing equipment with error compensation function according to claim 1, characterized in that: The upper end of the base (1) is provided with symmetrically distributed hydraulic rods (8), and the telescopic end of the hydraulic rods (8) is provided with clamping blocks.

6. The ball valve grinding and processing equipment with error compensation function according to claim 1, characterized in that: A pressure sensor (19) is provided at the piston end of the hydraulic rod (4).

7. The ball valve grinding and processing equipment with error compensation function according to claim 1, characterized in that: The blower (11) is provided with a negative pressure pipe (12) that penetrates the collection box (2) at the suction end. A filter screen (13) is provided at one end of the negative pressure pipe (12). A suction pipe (14) corresponding to the negative pressure pipe (12) and connected to the suction hood (3) is provided at one end of the collection box (2).

8. The ball valve grinding and processing equipment with error compensation function according to claim 1, characterized in that: The lower end of the collection box (2) is provided with an ash hopper (10), and the lower end of the ash hopper (10) is provided with a discharge pipe controlled by a valve.

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