Hole expanding device for valve body processing

Abstract

The present invention discloses a reaming device for valve body processing, which relates to valve body processing technology and comprises a movable workbench, wherein a rotation center is arranged on the workbench, a switching unit is also installed on the workbench, and further comprises a drilling head and a reaming head. In an initial state, the drilling head coincides with the rotation center; when drilling is completed, the switching unit drives the drilling head to leave the rotation center and make the reaming head coincide with the rotation center. The present invention provides a reaming device for valve body processing. After drilling is completed, the workbench moves upward and drives the drilling head to move upward synchronously. After the drilling head rises to a certain position, the switching unit drives the drilling head to leave the rotation center and make the reaming head coincide with the rotation center. In this way, the drilling head at the rotation center can be quickly switched to the reaming head without disassembling the drilling head, thereby improving the processing efficiency of the valve body and reducing the deviation caused by disassembly and assembly, thereby ensuring the processing accuracy.

Description

Technical Field

[0001] The invention relates to valve body processing technology, and in particular to a hole expanding device for valve body processing. Background Art

[0002] It is well known that the valve body is the core component of the valve, and the size, shape and surface quality of its internal holes have an important influence on the flow control, sealing performance and service life of the valve. In order to improve the processing accuracy and adapt to the requirements of different materials and apertures, it is necessary to expand the original internal holes on the valve body. For some small valve bodies, the valve body is generally drilled first and then the existing holes are expanded. The whole process is processed by rotating and pressing a drilling head or an expanding head.

[0003] For example, the patent with the authorization announcement number CN219025999U and the authorization announcement date May 16, 2023, entitled "A Precision Hole Expanding Device for Forging Valve Body Processing", includes a base, a first motor is fixedly connected to the right front side of the top of the base, a bidirectional threaded rod is fixedly connected to the output end of the first motor, a belt is provided on the right side of the outside of the bidirectional threaded rod, and the external threads of the bidirectional threaded rod are connected to two connecting blocks, and the adjacent sides of the two connecting blocks on the front and rear sides are fixedly connected to the outside of the clamping block. In this patent, through the coordinated use of structures such as belts and connecting blocks, the hole expanding device can adjust the size of the hole and can be clamped and fixed, thereby improving practicality, and through the coordinated use of structures such as water pumps and electric nozzles, the drill bit can be cooled during hole expanding, thereby increasing the service life of the drill bit and improving the hole expanding quality.

[0004] The shortcoming of the existing technology is that, in order to facilitate processing and ensure the processing accuracy of the valve body hole, the valve body is generally not moved. Instead, the same set of drilling equipment is used, and only the drilling head needs to be replaced with a reaming head. However, the entire disassembly and assembly process will not only reduce work efficiency, but may also cause deviation between the reaming head and the rotation center, affecting the processing accuracy. Summary of the invention

[0005] The object of the present invention is to provide a hole expanding device for valve body machining to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A reaming device for valve body processing, comprising a movable workbench, a rotation center is arranged on the workbench, a switching unit is installed on the workbench, and also comprises a drilling head and a reaming head, wherein in an initial state, the drilling head coincides with the rotation center;

[0008] When the drilling is completed, the switching unit drives the drilling head to leave the rotation center and makes the reaming head coincide with the rotation center.

[0009] The above-mentioned hole expanding device for valve body processing also includes a mounting frame, a sliding rod is fixedly connected to the mounting frame, the workbench is slidably mounted on the sliding rod, and a driving unit drives the workbench to move in the vertical direction.

[0010] In the above-mentioned reaming device for valve body processing, a rotating shaft is rotatably penetrated in the middle of the workbench, a driving motor is fixedly connected to the upper end of the rotating shaft, the driving motor is installed on the workbench, and the switching unit is installed at the lower end of the rotating shaft.

[0011] The above-mentioned reaming device for valve body processing, the switching unit includes a sliding limit part fixedly connected to the lower end of the rotating shaft, the sliding limit part is provided with a sliding groove, the lower end of the sliding groove passes through the sliding limit part, a switching part is slidably installed in the sliding groove, and a drilling head and a reaming head are respectively installed at the lower end of the switching part.

[0012] In the above-mentioned reaming device for valve body processing, the diameter of the reaming head is larger than the diameter of the drilling head.

[0013] The above-mentioned reaming device for valve body processing has two positioning blocks formed on the sliding limit portion, and a positioning opening is opened at the top of the slide groove. The positioning blocks are arranged corresponding to the positioning opening. One of the positioning blocks is located above the drilling head, and the other positioning block is located above the reaming head. In the initial state, the positioning block located above the drilling head is clamped in the positioning opening.

[0014] In the above-mentioned reaming device for valve body processing, a through hole is opened on the workbench, a spring rod is fixedly connected to the mounting frame, a movable section of the spring rod passes through the through hole and extends to below the through hole, and a circular cover is fixedly connected to the movable end of the spring rod.

[0015] In the above-mentioned hole expanding device for valve body processing, a trapezoidal driving block is fixed on the inner wall of the circular mask, and the trapezoidal driving block is arranged corresponding to the switching part.

[0016] In the above-mentioned reaming device for valve body processing, the circular mask is a circular cylindrical structure with an opening facing downward, the switching unit is located in the circular mask, the rotating shaft rotates and passes through the circular mask, and the rotating shaft coincides with the central axis of the circular mask.

[0017] In the above-mentioned reaming device for valve body processing, one end of the switching portion abuts against the inner wall of the circular cover.

[0018] In the above technical scheme, the present invention provides a reaming device for valve body processing, including a drilling head, a reaming head and a switching unit. After drilling is completed, the workbench moves upward and drives the drilling head to move upward synchronously. After the drilling head rises to a certain position, the switching unit drives the drilling head to leave the rotation center and make the reaming head coincide with the rotation center, and then drives the reaming head to rotate. Then, the workbench moves downward to make the reaming head move downward synchronously to reame the hole just drilled. In this way, the drilling head at the rotation center can be quickly switched to the reaming head without disassembling the drilling head, thereby improving the processing efficiency of the valve body, and reducing the deviation caused by disassembly and assembly, thereby ensuring the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a hole expanding device for valve body machining provided in one embodiment of the present invention.

[0021] Figure 2 A cross-sectional view of a hole expanding device for valve body machining provided in one embodiment of the present invention.

[0022] Figure 3 A partial cross-sectional view of a hole expanding device for valve body machining provided in one embodiment of the present invention.

[0023] Figure 4 A schematic diagram of a partial three-dimensional structure of a hole expanding device for valve body machining provided in one embodiment of the present invention.

[0024] Figure 5 A schematic diagram of the internal structure of a circular mask provided in yet another embodiment of the present invention.

[0025] Figure 6 A schematic diagram of the three-dimensional structure of a circular mask provided in another embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Workbench; 11. Mounting frame; 12. Slide rod; 13. Placement table; 14. Rotating shaft; 15. Through port; 16. Spring rod; 17. Circular shield; 171. Nozzle; 172. Sliding ring plate; 173. Compression spring; 174. Trapezoidal drive block; 175. First shield; 176. Second shield; 177. Annular ring; 178. Spiral groove; 179. Sliding connection part; 180. Elastic extrusion rod; 181. Discharge hole; 2. Switching unit; 21. Sliding limit part; 211. Positioning block; 212. Positioning port; 22. Slide groove; 23. Switching part; 3. Drilling head; 4. Reaming head. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-6 As shown, an embodiment of the present invention provides a reaming device for valve body processing, comprising a movable workbench 1, on which a rotation center is arranged, on which a switching unit 2 is also installed, and further comprising a drilling head 3 and a reaming head 4. In an initial state, the drilling head 3 coincides with the rotation center; when the drilling is completed, the switching unit 2 drives the drilling head 3 to leave the rotation center and makes the reaming head 4 coincide with the rotation center.

[0030] Specifically in the present embodiment, the workbench 1 is preferably a square plate-like structure. The present embodiment uses the vertical direction to illustrate its moving direction, that is, its moving direction is the movement in the vertical direction (those skilled in the art understand that it can also move in the horizontal direction). The workbench 1 is horizontally arranged, and the rotation center is located in the middle position of the workbench 1 and is perpendicular to the horizontal plane where the workbench 1 is located; the diameter of the drilling head 3 is smaller than that of the reaming head 4, and the drilling head 3 is mainly used for drilling holes in the valve body, and the reaming head 4 is mainly used for reaming the drilled holes. The drilling head 3 is preferably a twist drill, and the The shape of the reaming head 4 is similar to that of a twist drill, but it has more teeth and no transverse edge. The above-mentioned selections of the drilling head 3 and the reaming head 4 are all prior arts. In this embodiment, the shapes of the drilling head 3 and the reaming head 4 need to correspond to each other. The bottoms of the drilling head 3 and the reaming head 4 are on the same horizontal plane and there is a certain distance between the two. For the convenience of description, the shortest distance between the drilling head 3 and the reaming head 4 is defined as a first distance, and the distance between the axis of the hole opened on the valve body and the outer side wall of the valve body is a second distance. The first distance is greater than the second distance. This is to ensure that the reaming head 4 does not touch the valve body during drilling. The drilling head 3 does not contact the valve body during reaming; the rotation center corresponds to the axis of the hole to be drilled. In the initial state, the drilling head 3 coincides with the rotation center to facilitate drilling. When drilling is completed, the switching unit 2 drives the drilling head 3 to leave the rotation center and makes the reaming head 4 coincide with the rotation center to facilitate reaming. In this way, drilling and reaming are completed by the same device; in a complete working process, including drilling stroke, switching stroke and reaming stroke, during the drilling stroke: first fix the valve body, then drive the drilling head 3 to rotate and move downward through the workbench 1 The drilling head 3 is moved downward synchronously to drill a hole in the valve body; when switching the stroke: after the drilling is completed, the workbench 1 moves up and drives the drilling head 3 to reset. At this time, the switching unit 2 drives the drilling head 3 to leave the rotation center and makes the reaming head 4 coincide with the rotation center; during the reaming stroke: the reaming head 4 is driven to rotate and move downward through the workbench 1 so that the reaming head 4 moves downward synchronously to reame the existing hole; in this way, there is no need to disassemble the drilling head 3, the drilling head 3 at the rotation center can be quickly switched to the reaming head 4, which improves the valve body processing efficiency, reduces the deviation caused by disassembly and assembly, and ensures the processing accuracy.

[0031] In another embodiment provided by the present invention, it also includes a mounting frame 11, and a sliding rod 12 is fixedly connected to the mounting frame 11. The mounting frame 11 mainly provides a working place for the reaming device. The workbench 1 is slidably installed on the sliding rod 12, and a driving unit (not shown in the figure) drives the workbench 1 to move in the vertical direction. A placing table 13 is also installed on the mounting frame 11, and a positioning device for fixing the valve body is also provided on the placing table 13 (not shown in the figure). The installation and positioning of the valve body are existing technologies and will not be elaborated herein.

[0032] In another embodiment provided by the present invention, a rotating shaft 14 is rotatably provided in the middle of the workbench 1, and the axis of the rotating shaft 14 is the rotation center. A driving motor is fixedly connected to the upper end of the rotating shaft 14, and the driving motor is installed on the workbench 1. The switching unit 2 is installed at the lower end of the rotating shaft 14, and the rotating shaft 14 is driven by the driving motor to rotate so that the switching unit 2 rotates synchronously. In this way, the switching unit 2 is not used for switching but is only used to synchronously drive the drilling head 3 or the reaming head 4 coaxial with the rotating shaft 14 to rotate synchronously. In this way, the drilling head 3 or the reaming head 4 coinciding with the rotation center is rotated to facilitate drilling or reaming.

[0033] In another embodiment provided by the present invention, the switching unit 2 includes a sliding limit portion 21 fixedly connected to the lower end of the rotating shaft 14, and a slide groove 22 is opened on the sliding limit portion 21, and the slide groove 22 passes through the bottom surface of the sliding limit portion 21 to form an opening, and the cross-section of the slide groove 22 is T-shaped, and a switching portion 23 is slidably installed in the slide groove 22, and the switching portion 23 is a square plate-shaped structure, and a drilling head 3 and a reaming head 4 are respectively installed at the lower end of the switching portion 23. When the sliding limit portion 21 slides to a specific position in the slide groove 22, the drilling head 3 at the rotation center can be driven to switch to the reaming head 4; the diameter of the reaming head 4 is larger than the diameter of the drilling head 3, so as to meet the different size requirements for drilling and reaming in actual production.

[0034] In another embodiment provided by the present invention, two positioning blocks 211 are formed on the sliding limit portion 21. The positioning blocks 211 are preferably isosceles trapezoidal structures with inclined surfaces facing upward. The positioning blocks 211 are made of elastic material, preferably rubber. A positioning opening 212 is provided on the top wall of the slide groove 22. The positioning opening 212 is also an isosceles trapezoidal structure. The positioning blocks 211 and the positioning opening 212 are correspondingly arranged. The positioning blocks 211 can be snapped into the positioning opening 212. One of the positioning blocks 211 is located above the drilling head 3, and the other positioning block 211 is located on the reaming head 4. In the initial state, the positioning block 211 located above the drilling head 3 is clamped in the positioning port 212, which corresponds to the situation that the drilling head 3 coincides with the rotation center; when the drilling is completed, the sliding limit part 21 slides in the slide groove 22. At this time, the positioning block 211 located above the drilling head 3 is squeezed and forced to move out of the positioning port 212. When the sliding limit part 21 slides to a specific position, the positioning block 211 located above the reaming head 4 is clamped in the positioning port 212. In this way, the position of the sliding limit part 21 is limited so that it will not move easily during drilling or reaming.

[0035] In another embodiment provided by the present invention, a through opening 15 is provided on the workbench 1, and a spring rod 16 is fixedly connected to the mounting frame 11. The diameter of the through opening 15 is larger than the maximum diameter of the spring rod 16, that is, the spring rod 16 can movably pass through the workbench 1, and the movable section of the spring rod 16 passes through the through opening 15 and extends to the bottom of the through opening 15. A circular shield 17 is fixedly connected to the movable end of the spring rod 16. The circular shield 17 in this embodiment has the function of preventing waste from splashing. In the initial state, the top of the circular shield 17 is attached to the lower end of the workbench 1. When the workbench 1 moves downward, the top of the workbench 1 The circular mask 17 is pushed to move downward synchronously, so that when the workbench 1 moves downward, the circular mask 17 moves downward synchronously to cover the drilling or expanding hole. A receiving groove is provided at the lower end of the circular mask 17, and a sliding ring plate 172 is slidably installed in the receiving groove. A compression spring 173 is connected between the sliding ring plate 172 and the receiving groove. When the circular mask 17 moves downward, the sliding ring plate 172 first contacts the placement table 13. At this time, the circular mask 17 continues to move downward and squeezes the compression spring 173. In this way, the movement of the circular mask 17 is stabilized, and drilling or expanding holes is also facilitated.

[0036] In another embodiment provided by the present invention, a trapezoidal driving block 174 is fixed on the inner wall of the circular mask 17, and the trapezoidal driving block 174 is arranged to correspond to the switching portion 23. When the trapezoidal driving block 174 is stationary and the switching portion 23 moves upward, the trapezoidal driving block 174 will squeeze the switching portion 23 to slide. The inclined surface on the trapezoidal driving block 174 is located at the lower end of the trapezoidal driving block 174, and the inclined surface is inclined downward near the end of the circular mask 17. The trapezoidal driving block 174 is located above the switching portion 23 near the reaming head 4. One side; in a completed switching stroke, including a synchronous stroke, a compression stroke and a separation stroke, after the drilling is completed, it enters the synchronous stroke, at this time the workbench 1 moves upward, due to the elastic effect of the spring rod 16, the circular mask 17 is close to the lower end surface of the workbench 1 and rises synchronously, when the spring rod 16 is fully reset, the workbench 1 continues to move upward and enters the compression stroke, at this time the trapezoidal driving block 174 just contacts with the end of the switching portion 23 close to the end of the reaming head 4; during the compression stroke, the workbench 1 continues to move upward, at this time, since the spring rod 16 can still be retracted after being reset, the switching portion 23 squeezes the trapezoidal driving block 174 to move synchronously upward for a distance and retracts the spring rod 16 to the limit position; during the separation stroke, since the spring rod 16 has retracted to the limit position, the circular mask 17 can no longer continue to move upward, at this time the circular mask 17 is in a stationary state, the workbench 1 continues to move upward, the spring rod 16 passes through the through-port 15, and the switching portion 23 squeezes the trapezoidal driving block 174 upward, under the action of the inclined surface on the trapezoidal driving block 174, the The switching part 23 is squeezed to move in the direction away from the trapezoidal driving block 174. At this time, the movement of the switching part 23 is a combination of upward movement and sliding. The sliding of the switching part 23 also drives the reaming head 4 to move to the rotation center. In this way, the passive rapid switching of the reaming head 4 is achieved by utilizing the rising and resetting process of the workbench 1. In addition, it should be specially noted that the number of circles driven by the driving motor to drive the rotating shaft 14 to rotate is set in advance (a stepping motor can be used). When the rotating shaft 14 stops rotating, the switching part 23 corresponds to the trapezoidal driving block 174.

[0037] In another embodiment provided by the present invention, the circular mask 17 is a circular cylindrical structure with an opening facing downward, the switching unit 2 is located in the circular mask 17, the rotating shaft 14 rotates and passes through the circular mask 17, the rotating shaft 14 coincides with the central axis of the circular mask 17, and the circular mask 17 is connected to a nozzle 171, the nozzle 171 is connected to a water pump arranged outside, liquid is injected into the nozzle 171 through the water pump, the liquid is sprayed through the nozzle 171 to cool the drilling hole or the expansion hole, and the circular mask 17 is used to block splashing liquid or residue.

[0038] In another embodiment provided by the present invention, one end of the switching portion 23 abuts against the inner wall of the circular mask 17. If the drilling head 3 coincides with the rotation center, the end of the switching portion 23 close to the reaming head 4 slides and abuts against the inner wall of the circular mask 17; if the reaming head 4 coincides with the rotation center, the end of the switching portion 23 close to the drilling head 3 slides and abuts against the inner wall of the circular mask 17. The sliding abutment improves the stability of the switching portion 23 during rotation; and when the switching portion 23 rotates, the drilling head 3 or the reaming head 4 that is not located at the rotation center also rotates synchronously. At this time, the switching part 23 tends to be pulled outward (this direction is defined as the positive direction), but because the end of the switching part 23 that is pulled outward abuts against the inner wall of the circular mask 17, the switching part 23 is actually unable to move outward. In other words, the drilling head 3 or the reaming head 4 that is not located at the center of rotation at this time is equivalent to a counterweight. The drilling head 3 or the reaming head 4 that is not located at the center of rotation generates centrifugal force during rotation, and this centrifugal force will prevent the switching part 23 from sliding in the opposite direction, thereby further stabilizing the state of the switching part 23 and the sliding limit part 21 during rotation.

[0039] For further information, see Figure 5-6After drilling, the mixture of the drilled waste and the sprayed liquid (hereinafter referred to as waste) falls on the placement table 13, and then the hole is expanded, which is not convenient for waste collection. For this reason, this embodiment provides a further solution to centrally output the waste. In this embodiment, the circular mask 17 is a split structure, including a first mask 175 and a second mask 176. The main body of the first mask 175 is a cylindrical structure with a sealed upper end, and the main body of the second mask 176 is a cylindrical structure with two ends passing through. The first mask 175 is connected to the spring rod 16, and the space formed by the first mask 175 and the second mask 176 is defined as a working space. The second mask 176 is movably sleeved under the first mask 175. An annular ring 177 is formed on the upper end of the second mask 176, and the upper end of the annular ring 177 extends into the first mask 175. The annular ring 177 is located between the first mask 175 and the second mask 176, and the connection between the first mask 175 and the second mask 176 is controlled by the annular ring 177. The joint is sealed so that the gas cannot be output through the connection between the first mask 175 and the second mask 176. A spiral groove 178 is provided on the outer wall of the annular ring 177. A sliding connection part 179 is formed at the lower end of the first mask 175. The sliding connection part 179 is slidably installed in the spiral groove 178. The sliding connection part 179 includes a connected plate structure and a hemispherical body. The hemispherical body is slidably installed in the spiral groove 178. An elastic extrusion rod 180 is fixed to the upper end of the annular ring 177. An annular groove is provided on the inner wall of the first mask 175. The axis of the annular groove coincides with the axis of the first mask 175. The movable end of the elastic extrusion rod 180 is slidably connected in the annular groove. In this way, relative rotation can occur between the first mask 175 and the second mask 176. In addition, the first mask 175 and the second mask 176 can also slide relatively in the axial direction by compressing the elastic extrusion rod 180. A plurality of discharge holes 181 are provided at the lower end of the first mask 175.

[0040] When the drilling is completed, the workbench 1 is first reset to switch the reaming head 4 to the rotation center, and then continues to move downward to complete the reaming. During the downward movement of the workbench 1, the second mask 176 first contacts the placement table 13, and the workbench 1 continues to move downward. At this time, since the second mask 176 is blocked, when the first mask 175 moves downward, it will drive the sliding connection part 179 to move synchronously and slide relative to the second mask. Since the sliding connection part 179 is slidably installed in the spiral groove 178, the downward movement of the sliding connection part 179 will drive the spiral groove 178 to rotate, and also cause the second mask 176 to rotate. At this time, the rotation of the second mask 176 drives the annular ring 177 and the elastic extrusion rod 180 to rotate synchronously; during the rotation of the second mask 176, since the first mask 175 and the second mask 176 Relative sliding also occurs, so the elastic extrusion rod 180 is compressed and the working space is reduced; in a downward movement of the workbench 1, the second mask 176 rotates and the working space is reduced at the same time, so that the gas in the working space is discharged from the discharge hole 181, and the waste on the placement table 13 is also brought out with the movement of the gas, and the rotation of the second mask 176 will also drive the discharge hole 181 to move in a circular motion, so that the discharge hole 181 can output waste from multiple positions. In this way, the movement of the workbench 1 is utilized to quickly and centrally output the waste. As for the output waste, it can be collected by installing a ring-shaped collection frame on the workbench 1. The collection of concentrated output waste is a prior art and will not be repeated. The above work can complete the concentrated output and discharge of the waste. Through the above scheme, part of the waste can be output in time to reduce accumulation.

[0041] Furthermore, after drilling, the end of the switching part 23 close to the reaming head 4 is squeezed by the trapezoidal driving block 174 and moves away from the inner wall of the circular mask 17, so that the reaming head 4 moves to the rotation center. However, the switching part 23 cannot be reset in time after sliding. At this time, it is only necessary to make the driving motor drive the rotating shaft 14 to rotate a different number of times each time it is started. If the number of circles rotated by the rotating shaft 14 during drilling is A circles, then the number of circles rotated by the rotating shaft 14 during corresponding reaming is (A+0.5) circles. In this way, after reaming, when the end of the switching part 23 close to the drilling head 3 is attached to the inner wall of the circular mask 17, the end of the switching part 23 close to the drilling head 3 is still directly below the trapezoidal driving block 174. At this time, the workbench 1 rises again, so that the switching part 23 close to the drilling head 3 can be pushed to the initial position by the trapezoidal driving block 174, so that the reaming device in this embodiment can be used uninterruptedly.

[0042] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A hole expanding device for valve body processing, comprising a movable workbench, on which a rotation center is arranged, characterized in that: The workbench is also equipped with a switching unit, which also includes a drilling head and a reaming head. In the initial state, the drilling head coincides with the rotation center; When the drilling is completed, the switching unit drives the drilling head to leave the rotation center and makes the reaming head coincide with the rotation center; It also includes a mounting frame, on which a slide bar is fixedly connected, on which the workbench is slidably mounted, and a driving unit drives the workbench to move in a vertical direction; A rotating shaft is rotatably provided in the middle of the workbench, a driving motor is fixedly connected to the upper end of the rotating shaft, the driving motor is mounted on the workbench, and the switching unit is mounted on the lower end of the rotating shaft; The switching unit comprises a sliding limiter fixedly connected to the lower end of the rotating shaft, a sliding groove is provided on the sliding limiter, the lower end of the sliding groove passes through the sliding limiter, a switching part is slidably installed in the sliding groove, and a drilling head and a reaming head are respectively installed at the lower end of the switching part; The workbench is provided with a through opening, the mounting frame is fixedly connected with a spring rod, the movable section of the spring rod passes through the through opening and extends to below the through opening, and the movable end of the spring rod is fixedly connected with a circular cover; The circular mask comprises a first mask and a second mask, the main body of the first mask is a cylindrical structure with a sealed upper end, the main body of the second mask is a cylindrical structure with two ends penetrating, the first mask is connected to the spring rod, the second mask is movably sleeved under the first mask, an annular ring is formed at the upper end of the second mask, the upper end of the annular ring extends into the first mask, the annular ring is located between the first mask and the second mask, a spiral groove is provided on the outer wall of the annular ring, a sliding connection portion is formed at the lower end of the first mask, the sliding connection portion is slidably installed in the spiral groove, the sliding connection portion comprises a connected plate-like structure and a hemisphere, the hemisphere is slidably installed in the spiral groove, an elastic extrusion rod is fixedly connected to the upper end of the annular ring, an annular groove is provided on the inner wall of the first mask, the axis of the annular groove coincides with the axis of the first mask, the movable end of the elastic extrusion rod is slidably connected in the annular groove, the first mask and the second mask can also slide relative to each other in the axial direction by compressing the elastic extrusion rod, and a plurality of discharge holes are provided at the lower end of the first mask.

2. A valve body processing hole expanding device according to claim 1, characterized in that: The diameter of the reaming head is greater than the diameter of the drilling head.

3. A valve body processing hole expanding device according to claim 1, characterized in that: Two positioning blocks are formed on the sliding limit portion, and a positioning opening is opened at the top of the slide groove. The positioning blocks are arranged corresponding to the positioning opening. One positioning block is located above the drilling head, and the other positioning block is located above the reaming head. In the initial state, the positioning block located above the drilling head is clamped in the positioning opening.

4. A valve body processing hole expanding device according to claim 1, characterized in that: A trapezoidal driving block is fixed on the inner wall of the circular shield, and the trapezoidal driving block is arranged correspondingly to the switching part.

5. A valve body processing hole expanding device according to claim 1, characterized in that: The circular mask is a circular cylindrical structure with an opening facing downwards. The switching unit is located inside the circular mask. The rotating shaft rotates and penetrates the circular mask. The rotating shaft coincides with the central axis of the circular mask.

6. A valve body processing hole expanding device according to claim 5, characterized in that: One end of the switching portion abuts against the inner wall of the circular cover.

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