A valve stem surface polishing device

Abstract

The present invention provides a valve stem surface polishing device, which relates to the field of valve stem processing technology, and comprises: a supporting frame; three groups of positioning units are installed on the supporting frame, and the valve stems to be polished are respectively installed on the three groups of positioning units; a connecting unit is installed on the supporting frame; locking units are respectively installed on the three groups of positioning units; a driving unit is installed on the supporting frame; a polishing unit is installed on the top of the supporting frame; a protective unit is installed on the supporting frame; in the present invention, the provision of two return springs D enables the rectangular movable block and the control box to be normally stored in the rectangular storage frame, thereby avoiding accidental touch of the control box and reducing safety hazards; it solves the problem that although some polishing equipment is installed with a protective structure, the protective structure is poorly used by operators, resulting in easy accidental injury to operators and safety hazards.

Description

Technical Field

[0001] The invention belongs to the technical field of valve stem processing, and more specifically, particularly relates to a valve stem surface polishing device. Background Art

[0002] The valve stem is an important part of the valve, used for transmission, connected to the actuator or handle on the top, and directly drives the valve core to move or rotate below to achieve the valve opening or closing or regulation function; the valve stem needs to be polished before use to avoid the rough surface of the valve stem affecting the connection effect.

[0003] The valve stem polishing equipment currently used still has the following problems:

[0004] 1. When multiple valve stems need to be processed, the operator needs to tighten the valve stems individually, and loosen the valve stems individually after polishing, which increases the installation and removal time of the valve stems and reduces the polishing efficiency of the valve stems;

[0005] 2. Although protective structures are installed on some polishing equipment, the protective structures are not effectively used by operators, which makes it easy for operators to be injured accidentally, posing a safety hazard. Summary of the invention

[0006] The disclosed embodiment relates to a valve stem surface polishing device, which has a positioning unit, a connection unit, a locking unit, a driving unit, a polishing unit and a protection unit; it realizes the automatic separation of three bevel gears D and three bevel gears C during polishing, and the automatic engagement of the three bevel gears D with the three bevel gears C after polishing; the provision of two return springs D enables the rectangular movable block and the control box to be normally stored in the rectangular storage frame, thereby avoiding accidental touching of the control box and reducing safety hazards.

[0007] In a first aspect of the present disclosure, a valve stem surface polishing device is provided, which specifically comprises a supporting frame; three groups of positioning units are installed on the supporting frame, and the valve stems to be polished are respectively installed on the three groups of positioning units;

[0008] A connecting unit is installed on the supporting chassis, and the connecting unit is used to drive the three groups of positioning units to rotate; locking units are respectively installed on the three groups of positioning units, and the three groups of locking units are used to fix three valve stems to be polished;

[0009] A driving unit is installed on the supporting chassis, and the driving unit is used to tighten and loosen three sets of locking units; a polishing unit is installed on the top of the supporting chassis; and a protection unit is installed on the supporting chassis, and the protection unit is used to protect operating workers.

[0010] In at least some embodiments, the positioning unit includes: a bearing A, a rotating shaft A, a gear A and a positioning seat; the bearing A is installed on a supporting frame; the rotating shaft A is installed on the bearing A; the gear A is welded to the bottom end of the rotating shaft A; and the positioning seat is welded to the top of the rotating shaft A.

[0011] In at least some embodiments, the connecting unit includes: a bearing B, a rotating shaft B and a gear B; the bearing B is mounted on a supporting frame; the rotating shaft B is mounted on the bearing B; the gear B is welded to the bottom end of the rotating shaft B, and the gear B is meshed and connected with the gear A.

[0012] In at least some embodiments, the locking unit includes: a locking knob, a bevel gear C, a limit block and a return spring A; the locking knob is threadedly connected to the positioning seat; the bevel gear C is rotatably mounted on the outside of the locking knob, and a circle of limit slots is provided on the inner wall of the bevel gear C; the limit block is slidably mounted on the inside of the locking knob, and the outer end of the limit block is inserted into the upper limit slot; the return spring A is mounted on the inside of the limit block, and the inner end of the return spring A contacts with the locking knob.

[0013] In at least some embodiments, the driving unit includes: a circular guide shaft A, a movable bracket, a bevel gear D, a limit snap ring A and a return spring B; there are three circular guide shafts A, and the three circular guide shafts A are welded to the top of the support base; the movable bracket is slidably installed on the outside of the three circular guide shafts A; there are three bevel gears D, and the three bevel gears D are welded on the movable bracket, and the three bevel gears D are meshed and connected with three bevel gears C; there are three limit snap rings A, and the three limit snap rings A are welded to the top of the three circular guide shafts A, and the bottoms of the three limit snap rings A are in contact with the movable bracket; there are three return springs B, and the three return springs B are installed on the outside of the three circular guide shafts A, and the three return springs B are located between the support base and the movable bracket.

[0014] In at least some embodiments, the polishing unit includes: an electric cylinder, a mounting top plate, a motor and a mounting ring frame; the electric cylinders are provided with two in total, and the two electric cylinders are fixedly mounted on the top of the supporting base frame; the mounting top plate is fixedly mounted on the top of the two electric cylinders; the motor is fixedly mounted on the bottom of the mounting top plate; and the mounting ring frame is fixedly mounted on the output shaft of the motor.

[0015] In at least some embodiments, the polishing unit also includes: a grinding wheel ring, a hexagonal driving rod and a pushing rod; the grinding wheel ring is fixedly mounted on the outside of the mounting ring frame; the hexagonal driving rod is welded to the bottom of the mounting ring frame, and the hexagonal driving rod is also slidably connected to the rotating shaft B; there are three pushing rods in total, and the three pushing rods are slidably mounted on the mounting top plate.

[0016] In at least some embodiments, the polishing unit also includes: a limit snap ring B, a limit snap ring C and a return spring C; there are three limit snap rings B in total, and the three limit snap rings B are welded on the top ends of the three push rods, and the bottoms of the three limit snap rings B are in contact with the mounting top plate; there are three limit snap rings C in total, and the three limit snap rings C are welded on the outside of the three push rods; there are three return springs C in total, and the three return springs C are installed on the outside of the three push rods, and the three return springs C are located between the mounting top plate and the three limit snap rings C.

[0017] In at least some embodiments, the protection unit includes: a rectangular storage frame, a rectangular movable block, a control box and a circular guide shaft B; the rectangular storage frame is welded to the supporting frame; the rectangular movable block is slidably installed inside the rectangular storage frame; the control box is fixedly installed on the rectangular movable block; there are two circular guide shafts B, and the two circular guide shafts B are welded to the rectangular storage frame, and the two circular guide shafts B are also slidably connected to the rectangular movable block.

[0018] In at least some embodiments, the protective unit also includes: a return spring D, a connecting block, a protective baffle and a U-shaped handle; there are two return springs D, and the two return springs D are installed on the outside of two circular guide shafts B; the connecting block is inserted into the supporting base frame and the rectangular storage frame; the protective baffle is welded to the top of the connecting block; and the U-shaped handle is welded to the top of the protective baffle.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, when the two electric cylinders and the motor are working, the grinding wheel grinding ring slowly moves downward; when the motor drives the hexagonal driving rod to work, the three gears A automatically rotate under the action of the gear B, thereby realizing the automatic polishing of the surfaces of the three valve stems.

[0021] 2. In the present invention, when the three positioning seats rotate counterclockwise under the action of the hexagonal driving rod, the three bevel gears C rotate counterclockwise along the three bevel gears D. At this time, the three locking knobs rotate clockwise, so that the inner ends of the three locking knobs contact the three valve stems, which has a fixing effect on the three valve stems. When the three positioning seats rotate clockwise under the action of the hexagonal driving rod, the three bevel gears C rotate clockwise along the three bevel gears D. At this time, the three locking knobs rotate counterclockwise, so that the three locking knobs are separated from the three valve stems, which is convenient for the staff to remove the polished valve stems;

[0022] In addition, when the inner end of the locking knob contacts the valve stem and the bevel gear C rotates clockwise, the locking knob stops rotating, and the rotational force of the bevel gear C pushes the limit block to automatically move inward, thus preventing the locking knob from damaging the valve stem to be polished; when the bevel gear C rotates counterclockwise, the limit block will not move inward due to the shape of the limit slot, thus ensuring that the locking knob can be separated from the valve stem smoothly;

[0023] In addition, when the mounting top plate drives the grinding wheel grinding ring to move downward, the three push rods can push the movable bracket to move downward, so that the three bevel gears D are separated from the three bevel gears C. When the three return springs B are fully compressed, the movable bracket stops moving. At this time, the three return springs C are slowly compressed, realizing the automatic separation of the three bevel gears D from the three bevel gears C during polishing, and the automatic meshing of the three bevel gears D with the three bevel gears C after polishing.

[0024] 3. In the present invention, the two reset springs D are provided so that the rectangular movable block and the control box can be normally stored in the rectangular storage frame, thereby avoiding accidental touching of the control box and reducing potential safety hazards. When the connecting block is inserted into the supporting base frame and the rectangular storage frame, the rectangular movable block can drive the control box to move downward under the action of gravity, thereby ensuring that the protective baffle is in the protective position when the control box is pressed, thereby improving the protective effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0026] The drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0027] In the attached picture:

[0028] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0029] Figure 2 The present invention Figure 1 Schematic diagram of the rear side perspective structure.

[0030] Figure 3 The present invention Figure 1 Schematic diagram of the rear main viewing angle structure.

[0031] Figure 4 It is a structural schematic diagram of the positioning unit and the connecting unit of the present invention.

[0032] Figure 5 It is a schematic diagram of the central cutaway structure of the locking unit of the present invention.

[0033] Figure 6 The present invention Figure 5 Schematic diagram of the cross-section structure in the AA direction.

[0034] Figure 7 It is a structural schematic diagram of the supporting chassis and the driving unit of the present invention.

[0035] Figure 8 It is a schematic structural diagram of the polishing unit of the present invention.

[0036] Fig. 9 The present invention Figure 3 Schematic diagram of the local enlarged structure of area B in the middle.

[0037] Fig.10 It is a structural schematic diagram of the supporting chassis and the protection unit of the present invention.

[0038] Fig.11 The present invention Fig.10 Schematic diagram of the local enlarged structure of the C area in the middle.

[0039] List of reference numerals:

[0040] 1. Support chassis;

[0041] 2. Positioning unit; 201. Bearing A; 202. Rotating shaft A; 203. Gear A; 204. Positioning seat;

[0042] 3. Connecting unit; 301. Bearing B; 302. Rotating shaft B; 303. Gear B;

[0043] 4. Valve stem;

[0044] 5. Locking unit; 501. Locking knob; 502. Bevel gear C; 5021. Limiting slot; 503. Limiting block; 504. Return spring A;

[0045] 6. Driving unit; 601. Circular guide shaft A; 602. Movable bracket; 603. Bevel gear D; 604. Limiting snap ring A; 605. Return spring B;

[0046] 7. Polishing unit; 701. Electric cylinder; 702. Mounting top plate; 703. Motor; 704. Mounting ring frame; 705. Grinding wheel grinding ring; 706. Hexagonal driving rod; 707. Push rod; 708. Limiting snap ring B; 709. Limiting snap ring C; 710. Return spring C;

[0047] 8. Protection unit; 801. Rectangular storage frame; 802. Rectangular movable block; 803. Control box; 804. Circular guide shaft B; 805. Return spring D; 806. Connecting plug block; 807. Protection baffle; 808. U-shaped handle. DETAILED DESCRIPTION

[0048] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0049] Example: Please refer to Figures 1 to 11 As shown: The present invention provides a valve stem surface polishing device, comprising a supporting frame 1; three groups of positioning units 2 are installed on the supporting frame 1, and the valve stems 4 to be polished are respectively installed on the three groups of positioning units 2;

[0050] A connecting unit 3 is installed on the supporting chassis 1, and the connecting unit 3 is used to drive the three groups of positioning units 2 to rotate; locking units 5 are respectively installed on the three groups of positioning units 2, and the three groups of locking units 5 are used to fix three valve stems 4 to be polished;

[0051] A driving unit 6 is installed on the supporting frame 1, and the driving unit 6 is used to tighten and loosen the three sets of locking units 5; a polishing unit 7 is installed on the top of the supporting frame 1; and a protection unit 8 is installed on the supporting frame 1, and the protection unit 8 is used to protect the operating workers.

[0052] In the present disclosure, Figure 4 and Figure 8 As shown, the positioning unit 2 includes: a bearing A201, a rotating shaft A202, a gear A203 and a positioning seat 204; the bearing A201 is mounted on the supporting base 1; the rotating shaft A202 is mounted on the bearing A201; the gear A203 is welded to the bottom end of the rotating shaft A202; and the positioning seat 204 is welded to the top of the rotating shaft A202;

[0053] The connecting unit 3 includes: a bearing B301, a rotating shaft B302 and a gear B303; the bearing B301 is mounted on the supporting frame 1; the rotating shaft B302 is mounted on the bearing B301; the gear B303 is welded to the bottom end of the rotating shaft B302, and the gear B303 is meshed and connected with the gear A203;

[0054] The polishing unit 7 includes: an electric cylinder 701, a mounting top plate 702, a motor 703 and a mounting ring frame 704; there are two electric cylinders 701 in total, and the two electric cylinders 701 are fixedly installed on the top of the supporting base frame 1; the mounting top plate 702 is fixedly installed on the top of the two electric cylinders 701; the motor 703 is fixedly installed on the bottom of the mounting top plate 702; the mounting ring frame 704 is fixedly installed on the output shaft of the motor 703; the polishing unit 7 also includes: a grinding wheel grinding ring 705, a hexagonal driving rod 706 and a pushing rod 707; the grinding wheel grinding ring 705 is fixedly installed on the outside of the mounting ring frame 704; the hexagonal driving rod 706 is welded to the bottom of the mounting ring frame 704, and the hexagonal driving rod 706 is also slidably connected to the rotating shaft B302; the pushing rod There are three 707s in total, and the three push rods 707 are slidably installed on the mounting top plate 702; the polishing unit 7 also includes: a limit snap ring B708, a limit snap ring C709 and a return spring C710; there are three limit snap rings B708 ​​in total, and the three limit snap rings B708 ​​are welded on the top ends of the three push rods 707, and the bottoms of the three limit snap rings B708 ​​are in contact with the mounting top plate 702; there are three limit snap rings C709 in total, and the three limit snap rings C709 are welded on the outside of the three push rods 707; there are three return springs C710 in total, and the three return springs C710 are installed on the outside of the three push rods 707, and the three return springs C710 are located between the mounting top plate 702 and the three limit snap rings C709;

[0055] Its specific function is: because the mounting top plate 702 is fixedly mounted on the top of the two electric cylinders 701, and the grinding wheel grinding ring 705 is fixedly mounted on the outside of the mounting ring frame 704, when the two electric cylinders 701 and the motor 703 are working, the grinding wheel grinding ring 705 slowly moves downward, and because the gear B303 is welded to the bottom end of the rotating shaft B302, and the gear B303 is meshed and connected with the gear A203, and the hexagonal driving rod 706 is also slidably connected with the rotating shaft B302, when the motor 703 is working, the three gears A203 automatically rotate under the action of the gear B303, thereby realizing automatic polishing of the surfaces of the three valve stems 4.

[0056] In the present disclosure, Figures 5 to 9 As shown, the locking unit 5 includes: a locking knob 501, a bevel gear C502, a limit block 503 and a return spring A504; the locking knob 501 is threadedly connected to the positioning seat 204; the bevel gear C502 is rotatably mounted on the outside of the locking knob 501, and a circle of limit slots 5021 are provided on the inner wall of the bevel gear C502; the limit block 503 is slidably mounted inside the locking knob 501, and the outer end of the limit block 503 is inserted into the upper limit slot 5021; the return spring A504 is mounted inside the limit block 503, and the inner end of the return spring A504 contacts the locking knob 501;

[0057] The driving unit 6 includes: a circular guide shaft A601, a movable bracket 602, a bevel gear D603, a limit snap ring A604 and a return spring B605; there are three circular guide shafts A601, and the three circular guide shafts A601 are welded on the top of the support base 1; the movable bracket 602 is slidably installed on the outside of the three circular guide shafts A601; there are three bevel gears D603, and the three bevel gears D603 are welded on the movable bracket 602, and the three bevel gears D603 are meshed and connected with the three bevel gears C502; there are three limit snap rings A604, and the three limit snap rings A604 are welded on the top of the three circular guide shafts A601, and the bottom of the three limit snap rings A604 is in contact with the movable bracket 602; there are three return springs B605, and the three return springs B605 are installed on the outside of the three circular guide shafts A601, and the three return springs B605 are located between the support base 1 and the movable bracket 602;

[0058] Its specific function is as follows: because the three bevel gears D603 are welded on the movable bracket 602, and the three bevel gears D603 are meshed and connected with the three bevel gears C502, when the three positioning seats 204 rotate counterclockwise under the action of the hexagonal driving rod 706, the three bevel gears C502 rotate counterclockwise along the three bevel gears D603, at this time, the three locking knobs 501 rotate clockwise, so that the inner ends of the three locking knobs 501 contact the three valve stems 4, which has a fixing effect on the three valve stems 4, when the three positioning seats 204 rotate clockwise under the action of the hexagonal driving rod 706, the three bevel gears C502 rotate clockwise along the three bevel gears D603, at this time, the three locking knobs 501 rotate counterclockwise, so that the three locking knobs 501 are separated from the three valve stems 4, so that the staff can remove the polished valve stems 4 conveniently;

[0059] Because the inner wall of the bevel gear C502 is provided with a circle of limit slots 5021, and the outer end of the limit block 503 is inserted into the upper limit slot 5021, and the return spring A504 is installed inside the limit block 503, when the inner end of the locking knob 501 contacts the valve stem 4 and the bevel gear C502 rotates clockwise, the locking knob 501 stops rotating, and the rotational force of the bevel gear C502 pushes the limit block 503 to automatically move inward, thereby preventing the locking knob 501 from damaging the valve stem 4 to be polished; when the bevel gear C502 rotates counterclockwise, the limit block 503 will not move inward due to the shape of the limit slot 5021, thereby ensuring that the locking knob 501 can be separated from the valve stem 4 smoothly;

[0060] Because the movable bracket 602 is slidably installed on the outside of the three circular guide shafts A601, and the three push rods 707 are slidably installed on the mounting top plate 702, and the elastic force of the three return springs C710 is much greater than the elastic force of the three return springs B605, when the mounting top plate 702 drives the grinding wheel grinding ring 705 to move downward, the three push rods 707 can push the movable bracket 602 to move downward, so that the three bevel gears D603 are separated from the three bevel gears C502. When the three return springs B605 are fully compressed, the movable bracket 602 stops moving. At this time, the three return springs C710 are slowly compressed, thereby realizing the automatic separation of the three bevel gears D603 and the three bevel gears C502 during polishing, and the automatic meshing of the three bevel gears D603 and the three bevel gears C502 after polishing.

[0061] In the present disclosure, Fig.10 and Fig.11 As shown, the protection unit 8 includes: a rectangular storage frame 801, a rectangular movable block 802, a control box 803 and a circular guide shaft B804; the rectangular storage frame 801 is welded on the supporting base frame 1; the rectangular movable block 802 is slidably installed inside the rectangular storage frame 801; the control box 803 is fixedly installed on the rectangular movable block 802; there are two circular guide shafts B804, and the two circular guide shafts B804 are welded on the rectangular storage frame 801, and the two circular guide shafts B804 are also connected to the The rectangular movable block 802 is slidably connected; the protection unit 8 also includes: a reset spring D805, a connecting plug block 806, a protection baffle 807 and a U-shaped handle 808; there are two reset springs D805, and the two reset springs D805 are installed outside the two circular guide shafts B804; the connecting plug block 806 is inserted into the supporting base frame 1 and the rectangular storage frame 801; the protection baffle 807 is welded to the top of the connecting plug block 806; the U-shaped handle 808 is welded to the top of the protection baffle 807;

[0062] Its specific function is: because the rectangular movable block 802 is slidably installed inside the rectangular storage frame 801, and the control box 803 is fixedly installed on the rectangular movable block 802, and the two reset springs D805 are installed on the outside of the two circular guide shafts B804, the rectangular movable block 802 and the control box 803 can be normally stored in the rectangular storage frame 801, avoiding accidental touching of the control box 803 and reducing safety hazards. When the connecting block 806 is inserted into the supporting base frame 1 and the rectangular storage frame 801, under the action of gravity, the rectangular movable block 802 can drive the control box 803 to move downward, ensuring that when the control box 803 is pressed, the protective baffle 807 is in the protective position, thereby improving the protective effect.

[0063] The specific usage and function of this embodiment are as follows:

[0064] When the present invention is used, the valve stem 4 to be polished is first placed in the three positioning seats 204, and then the motor 703 is started through the control box 803. When the three positioning seats 204 rotate counterclockwise under the action of the hexagonal driving rod 706, the three bevel gears C502 rotate counterclockwise along the three bevel gears D603. At this time, the three locking knobs 501 rotate clockwise, so that the inner ends of the three locking knobs 501 contact the three valve stems 4, which has a fixing effect on the three valve stems 4. When the bevel gear C502 still rotates clockwise after the inner end of the locking knob 501 contacts the valve stem 4, the locking knob 501 stops rotating, and the rotational force of the bevel gear C502 pushes the limit block 503 to move inward automatically, thereby preventing the locking knob 501 from damaging the valve stem 4 to be polished; then, the control box 803 is used. Start the two electric cylinders 701 and the motor 703. At this time, the grinding wheel grinding ring 705 moves slowly downward. When the motor 703 is working, the three gears A203 automatically rotate under the action of the gear B303, realizing the automatic polishing of the surfaces of the three valve stems 4. When the mounting top plate 702 drives the grinding wheel grinding ring 705 to move downward, the three push rods 707 can push the movable bracket 602 to move downward, so that the three bevel gears D603 are separated from the three bevel gears C502. When the three return springs B605 are fully compressed, the movable bracket 602 stops moving. At this time, the three return springs C710 are slowly compressed, realizing the automatic separation of the three bevel gears D603 and the three bevel gears C502 during polishing. After polishing, the three bevel gears D603 are automatically meshed with the three bevel gears C502.

[0065] After the valve stem 4 is polished, the motor 703 is started through the control box 803. When the three positioning seats 204 rotate clockwise under the action of the hexagonal driving rod 706, the three bevel gears C502 rotate clockwise along the three bevel gears D603. At this time, the three locking knobs 501 rotate counterclockwise to separate the three locking knobs 501 from the three valve stems 4, making it convenient for the staff to remove the polished valve stem 4. When the bevel gear C502 rotates counterclockwise, the limit block 503 will not move inward due to the shape of the limit slot 5021, ensuring The locking knob 501 can be separated from the valve stem 4 smoothly. The two reset springs D805 are provided so that the rectangular movable block 802 and the control box 803 can be normally stored in the rectangular storage frame 801, avoiding accidental touching of the control box 803 and reducing safety hazards. When the connecting block 806 is inserted into the supporting base 1 and the rectangular storage frame 801, under the action of gravity, the rectangular movable block 802 can drive the control box 803 to move downward, ensuring that when the control box 803 is pressed, the protective baffle 807 is in the protective position, thereby improving the protective effect.

[0066] In this article, there are a few points to note:

[0067] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0068] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0069] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A valve stem surface polishing device, comprising a supporting frame (1); characterized in that: Three groups of positioning units (2) are installed on the supporting base frame (1), and valve stems (4) to be polished are respectively installed on the three groups of positioning units (2); A connecting unit (3) is installed on the supporting base frame (1), and the connecting unit (3) is used to drive the three groups of positioning units (2) to rotate; locking units (5) are respectively installed on the three groups of positioning units (2), and the three groups of locking units (5) are used to fix three valve stems (4) to be polished; The support frame (1) is provided with a driving unit (6), and the driving unit (6) is used to tighten and loosen the three sets of locking units (5); a polishing unit (7) is provided on the top of the support frame (1); a protection unit (8) is provided on the support frame (1), and the protection unit (8) is used to protect the operating workers; The positioning unit (2) comprises: a bearing A (201), a rotating shaft A (202), a gear A (203) and a positioning seat (204); the bearing A (201) is mounted on the supporting base frame (1); the rotating shaft A (202) is mounted on the bearing A (201); the gear A (203) is welded to the bottom end of the rotating shaft A (202); and the positioning seat (204) is welded to the top of the rotating shaft A (202); The locking unit (5) comprises: a locking knob (501), a bevel gear C (502), a limit block (503) and a return spring A (504); the locking knob (501) is threadedly connected to the positioning seat (204); the bevel gear C (502) is rotatably mounted on the outside of the locking knob (501), and the inner wall of the bevel gear C (502) is provided with a circle of limit slots (5021); the limit block (503) is slidably mounted inside the locking knob (501), and the outer end of the limit block (503) is inserted into the upper limit slot (5021); the return spring A (504) is mounted inside the limit block (503), and the inner end of the return spring A (504) is in contact with the locking knob (501); The driving unit (6) comprises: a circular guide shaft A (601), a movable bracket (602), a bevel gear D (603), a limit clamp ring A (604) and a return spring B (605); the circular guide shafts A (601) are provided in total of three, and the three circular guide shafts A (601) are welded to the top of the support base (1); the movable bracket (602) is slidably mounted on the outside of the three circular guide shafts A (601); the bevel gears D (603) are provided in total of three, and the three bevel gears D (603) are welded to the movable bracket (602), and the three The bevel gear D (603) is meshedly connected with the three bevel gears C (502); a total of three limit snap rings A (604) are provided, and the three limit snap rings A (604) are welded to the top ends of the three circular guide shafts A (601), and the bottom ends of the three limit snap rings A (604) are in contact with the movable bracket (602); a total of three return springs B (605) are provided, and the three return springs B (605) are installed outside the three circular guide shafts A (601), and the three return springs B (605) are located between the support base (1) and the movable bracket (602).

2. A valve stem surface polishing device according to claim 1, characterized in that: The connection unit (3) comprises: a bearing B (301), a rotating shaft B (302) and a gear B (303); the bearing B (301) is mounted on the supporting base frame (1); the rotating shaft B (302) is mounted on the bearing B (301); the gear B (303) is welded to the bottom end of the rotating shaft B (302), and the gear B (303) is meshedly connected with the gear A (203).

3. A valve stem surface polishing device according to claim 2, characterized in that: The polishing unit (7) comprises: an electric cylinder (701), a mounting top plate (702), a motor (703) and a mounting ring frame (704); two electric cylinders (701) are provided, and the two electric cylinders (701) are fixedly mounted on the top of the supporting base frame (1); the mounting top plate (702) is fixedly mounted on the top of the two electric cylinders (701); the motor (703) is fixedly mounted on the bottom of the mounting top plate (702); and the mounting ring frame (704) is fixedly mounted on the output shaft of the motor (703).

4. A valve stem surface polishing device according to claim 3, characterized in that: The polishing unit (7) further comprises: a grinding wheel grinding ring (705), a hexagonal driving rod (706) and a pushing rod (707); the grinding wheel grinding ring (705) is fixedly mounted on the outside of the mounting ring frame (704); the hexagonal driving rod (706) is welded to the bottom of the mounting ring frame (704), and the hexagonal driving rod (706) is also slidably connected to the rotating shaft B (302); a total of three pushing rods (707) are provided, and the three pushing rods (707) are slidably mounted on the mounting top plate (702).

5. The valve stem surface polishing device according to claim 4, characterized in that: The polishing unit (7) further comprises: a limit snap ring B (708), a limit snap ring C (709) and a return spring C (710); three limit snap rings B (708) are provided, and the three limit snap rings B (708) are welded to the top ends of the three push rods (707), and the bottom ends of the three limit snap rings B (708) are in contact with the mounting top plate (702); three limit snap rings C (709) are provided, and the three limit snap rings C (709) are welded to the outside of the three push rods (707); three return springs C (710) are provided, and the three return springs C (710) are installed on the outside of the three push rods (707), and the three return springs C (710) are located between the mounting top plate (702) and the three limit snap rings C (709).

6. The valve stem surface polishing device according to claim 1, characterized in that: The protection unit (8) comprises: a rectangular storage frame (801), a rectangular movable block (802), a control box (803) and a circular guide shaft B (804); the rectangular storage frame (801) is welded to the supporting base frame (1); the rectangular movable block (802) is slidably mounted inside the rectangular storage frame (801); the control box (803) is fixedly mounted on the rectangular movable block (802); two circular guide shafts B (804) are provided, and the two circular guide shafts B (804) are welded to the rectangular storage frame (801), and the two circular guide shafts B (804) are also slidably connected to the rectangular movable block (802).

7. A valve stem surface polishing device according to claim 6, characterized in that: The protection unit (8) further comprises: a return spring D (805), a connecting plug block (806), a protection baffle (807) and a U-shaped handle (808); two return springs D (805) are provided, and the two return springs D (805) are installed outside the two circular guide shafts B (804); the connecting plug block (806) is inserted into the support base frame (1) and the rectangular storage frame (801); the protection baffle (807) is welded to the top of the connecting plug block (806); and the U-shaped handle (808) is welded to the top of the protection baffle (807).

Images