Valve seat tapping machine with automatic feeding and discharging functions

Abstract

The automatic feeding and discharging valve seat tapping machine comprises a rack body, an operation table is arranged at the upper end of the rack body, a movable clamping mechanism is slidably connected to the middle of the upper end of the operation table, a protection frame is installed on the outer side of the upper end of the operation table, and a tapping mechanism is installed in the middle of the upper end in the protection frame; a feeding and discharging mechanism is installed on the front side in the protection frame, and fixed fans are symmetrically and obliquely arranged on the two sides between the feeding and discharging mechanism and the tapping mechanism. According to the valve seat tapping machine capable of achieving automatic feeding and discharging, through the feeding and discharging mechanism, a valve seat can be conveniently conveyed to the position between the two clamping seats to be clamped and fixed, meanwhile, through a lead screw structure, an unmachined valve seat can be conveniently conveyed to the position under a tapping tool bit to be subjected to feeding operation, and the machined valve seat is not prone to falling off. The clamping seats are driven by the lead screw mechanism to move to the position under the mechanical claw, then the machined valve seat is taken out of the two clamping seats through the mechanical claw, discharging operation is conducted, and the practicability during use is improved.

Description

Technical Field

[0001] The invention relates to the technical field related to valve seat processing, and in particular to a valve seat tapping machine with automatic loading and unloading. Background Art

[0002] Ball valve, the opening and closing parts are driven by the valve stem and rotate around the axis of the ball valve. It can also be used for fluid regulation and control. The hard-sealed V-type ball valve has a strong shear force between its V-type ball core and the metal valve seat welded with hard alloy, which is particularly suitable for media containing fibers, tiny solid particles, etc. The multi-way ball valve can not only flexibly control the confluence, diversion, and flow direction switching of the medium on the pipeline. In the production process of the ball valve seat, it involves tapping the middle hole at the top of the valve seat, which is convenient for the installation of the gland. The tapping machine is a machine tool that uses a tap to process internal threads. It is the most widely used internal thread processing machine tool. According to national mechanical standards, the tapping machine series is divided into desktop tapping machines, semi-automatic desktop tapping machines, vertical tapping machines and horizontal tapping machines.

[0003] The existing tapping machine has poor clamping stability for the valve seat workpiece during processing, which easily causes tapping deviation and reduces processing efficiency. There is no automatic loading and unloading mechanism, so manual operation is required during loading and unloading, which reduces practicality. At the same time, the tapping machine will generate a large amount of iron chips when tapping and drilling during processing. The iron chips will be scattered around the workpiece. After processing, they need to be cleaned, which is time-consuming and labor-intensive and increases labor intensity. In view of the above problems, it is necessary to improve the existing equipment. Summary of the invention

[0004] The object of the present invention is to provide a valve seat tapping machine with automatic loading and unloading, so as to solve the problem that the existing tapping machine proposed in the above background technology has poor clamping stability for the valve seat workpiece during processing, which easily causes tapping deviation and reduces processing efficiency, and no automatic loading and unloading mechanism is provided, so that manual operation is required during loading and unloading, which reduces the practicality of use. At the same time, the tapping machine will generate a large amount of iron chips when tapping and drilling during processing, and the iron chips will be scattered around the workpiece. After processing, it needs to be cleaned, which is time-consuming and labor-intensive and increases labor intensity.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a valve seat tapping machine with automatic loading and unloading, comprising a frame body,

[0006] An operating table is arranged at the upper end of the frame body, and a mobile clamping mechanism is slidably connected to the middle of the upper end of the operating table, and the mobile clamping mechanism includes a mobile base, a vertical plate, an electric telescopic rod, a driving box, a first connecting column and a clamping seat, and slide seats are symmetrically installed on both sides of the lower end of the mobile base, and the slide seats are slidably connected to the linear guide rails installed inside the upper ends of the operating table, and vertical plates are symmetrically installed on both sides of the upper end of the mobile base, and electric telescopic rods are symmetrically arranged on opposite sides of the two vertical plates, and the output end of the electric telescopic rod is connected to one side of the driving box, and the other side of the driving box is connected to the clamping seat through the first connecting column;

[0007] A protective frame is installed on the outer side of the upper end of the operating table, and a tapping mechanism is installed in the middle of the upper end of the protective frame. At the same time, the tapping mechanism is located above the middle of the movable clamping mechanism. A loading and unloading mechanism is installed on the front side of the protective frame, and fixed fans are symmetrically inclined on both sides between the loading and unloading mechanism and the tapping mechanism.

[0008] Preferably, the cavity arranged in the middle of the upper end of the frame body and the middle of the lower end of the operating table is a waste storage chamber, and dust baffles are installed on both sides of the front of the waste storage chamber by fixing screws. At the same time, a movable through groove is opened in the middle of the operating table, and the movable through groove is located above the waste storage chamber, and screw rod structures are symmetrically arranged on both sides of the movable through groove, and the two screw rod structures are connected to both sides of the lower end of the movable base.

[0009] Preferably, a first slide is symmetrically opened on both sides of the middle upper end of the movable base, and the first slide is connected to the bottom of the first self-locking roller arranged at the lower end of the driving box, and a second slide is symmetrically opened on the front and rear sides of the upper end of the movable base, and the second slide is respectively connected to the bottom of the second self-locking roller arranged on both sides of the lower end of the clamping seat.

[0010] Preferably, a first drive motor is installed in the middle of the back side of the drive box, and the output end of the first drive motor passes through the drive box and is connected to one end of the gear set, while the other end of the gear set is meshed with the first threaded rod, and the first threaded rod passes through one side of the drive box and is threadedly connected to a threaded hole opened inside the first connecting column.

[0011] Preferably, a first movable plate is installed on the back side of the first connecting column close to the drive box, and the first movable plate is slidably connected to a first fixed rod arranged between the clamping seat and the drive box, and one end of the first fixed rod is fixed on the drive box, and the middle of one side of the clamping seat is an arc structure, and adhesive pads are equidistantly installed inside the arc structure.

[0012] Preferably, a control box is installed on the back of the protective frame, and a control device is arranged inside the control box, and the control device is electrically connected to a control panel arranged in a groove opened inside one side of the protective frame.

[0013] Preferably, the tapping mechanism includes an installation and fixing frame, a second drive motor, a second threaded rod, a second connecting column, a fixing bracket, a third drive motor and a tapping head. The installation and fixing frame is installed at the upper end of the protective frame, and the second drive motor is installed in the middle of the lower end of the protective frame. At the same time, the output end of the second drive motor is connected to the second threaded rod, and the lower end of the second threaded rod is threadedly connected to the threaded hole opened in the middle of the second connecting column, and a fixing bracket is installed at the lower end of the second connecting column, and the third drive motor is installed in the middle of the lower end of the fixing bracket, and a tapping head is installed at the output end of the third drive motor.

[0014] Preferably, second movable plates are symmetrically installed on both sides of the second connecting column, and the two second movable plates are slidably connected to corresponding second fixed rods, the upper ends of the second fixed rods are connected to the inner sides of the upper end of the mounting fixed frame, and the lower ends of the second fixed rods pass through the fixed bracket and are connected to the limit block.

[0015] Preferably, the loading and unloading mechanism includes a sliding frame, a driving belt, a moving seat, an electric push rod and a mechanical claw. The two ends of the sliding frame are connected to the two sides inside the protective frame, and the moving seat is installed on the sliding frame. At the same time, the moving seat is connected to the driving belt arranged on the sliding frame. A plurality of electric push rods are arranged at the bottom of the lower end of the moving seat, and the output end of the electric push rod is connected to the upper end of the mechanical claw.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the valve seat tapping machine with automatic loading and unloading,

[0017] (1) In order to solve the problem that the existing tapping machine has poor clamping stability for the valve seat workpiece during processing, which easily causes tapping deviation and reduces processing efficiency, the present application is provided with a mobile clamping mechanism, which drives the drive box to move by an electric telescopic rod, so that the first threaded rod in the drive box drives the first connecting column to move the clamping seat, so that the adhesive pad set in the arc groove of the mobile clamping seat fits with the outside of the valve seat shell, thereby clamping and fixing the valve seat, and the first movable plate and the first fixed rod, the first self-locking roller and the first slideway, and the second self-locking roller and the second slideway are used in combination to improve the stability of the movement of the clamping seat, so that the clamping seat is not easily deviated, thereby improving the accuracy of tapping;

[0018] (2) In order to solve the problem that the existing tapping machine is not provided with an automatic loading and unloading mechanism during processing, so that manual operation is required during loading and unloading, which reduces the practicality of use, the present application is provided with a loading and unloading mechanism and a screw structure. The loading and unloading mechanism facilitates the valve seat to be transported to the middle of the two clamping seats for clamping and fixing. At the same time, the screw structure facilitates the unprocessed valve seat to be transported to the bottom of the tapping cutter head for loading operation. The processed valve seat is driven by the screw mechanism to move to the bottom of the mechanical claw, and then the processed valve seat is taken out from the two clamping seats by the mechanical claw for unloading operation, thereby improving the practicality of use.

[0019] (3) In order to solve the problem that the existing tapping machines generate a large amount of iron chips during tapping and drilling, and the iron chips will be scattered around the workpiece. After the processing is completed, they need to be cleaned, which is time-consuming and labor-intensive, and increases labor intensity, the present application is provided with a waste storage chamber, a dust baffle, a movable slot and a fixed fan. The fixed fan rotates to generate airflow, which is convenient for blowing the iron chips generated during tapping into the waste storage chamber through the movable slot for storage, so that the area around the workpiece is cleaned. When cleaning is needed, the dust baffle only needs to be removed to clean the iron chips stored in the waste storage chamber, thereby effectively improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0021] Figure 2 It is a front view structural schematic diagram of the present invention;

[0022] Figure 3 It is a rear view structural schematic diagram of the present invention;

[0023] Figure 4 This is a front view structural diagram of the loading and unloading mechanism of the present invention;

[0024] Figure 5 It is a schematic diagram of a top cross-sectional structure of a mobile clamping mechanism of the present invention;

[0025] Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle;

[0026] Figure 7 It is a schematic diagram of the top view of the movable clamping mechanism of the present invention;

[0027] Figure 8 It is a schematic diagram of the front cross-sectional structure of the tapping mechanism of the present invention.

[0028] In the figure: 1, frame body; 101, waste storage chamber; 102, dust baffle; 2, operating table; 201, mobile slot; 3, screw rod structure; 4, mobile clamping mechanism; 401, mobile base; 4011, first slide; 4012, second slide; 402, vertical plate; 403, electric telescopic rod; 404, drive box; 4041, first drive motor; 4042, gear set; 4043, first threaded rod; 405, first connecting column; 406, clamping seat; 407, adhesive pad; 408, first mobile Moving plate; 409, first fixed rod; 5, protective frame; 6, fixed fan; 7, tapping mechanism; 701, mounting bracket; 702, second drive motor; 703, second threaded rod; 704, second connecting column; 705, fixed bracket; 706, second moving plate; 707, second fixed rod; 708, third drive motor; 709, tapping tool head; 8, loading and unloading mechanism; 801, sliding frame; 802, driving belt; 803, moving seat; 804, electric push rod; 805, mechanical claw; 9, control box. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-8 The present invention provides a technical solution: a valve seat tapping machine with automatic loading and unloading, according to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7As shown, an operating table 2 is arranged at the upper end of the frame body 1, and a mobile clamping mechanism 4 is slidably connected to the middle of the upper end of the operating table 2. At the same time, the mobile clamping mechanism 4 includes a mobile base 401, a vertical plate 402, an electric telescopic rod 403, a drive box 404, a first connecting column 405 and a clamping seat 406. Slides are symmetrically installed on both sides of the lower end of the mobile base 401, and the slides are slidably connected to the linear guide rails installed inside the upper ends of the operating table 2. First slideways 4011 are symmetrically opened on both sides of the middle of the upper end of the mobile base 401, and the first slideways 4011 are connected to the drive box. The first self-locking roller bottom connection set at the lower end of 404 is convenient for improving the stability of the movement of the drive box 404. The second slideway 4012 is symmetrically opened on the front and rear sides of the upper end of the mobile base 401, and the second slideway 4012 is respectively connected to the bottom of the second self-locking roller set on both sides of the lower end of the clamping seat 406, so as to improve the stability of the movement of the clamping seat 406. At the same time, vertical plates 402 are symmetrically installed on both sides of the upper end of the mobile base 401. Electric telescopic rods 403 are symmetrically arranged on the opposite sides of the two vertical plates 402, and the output end of the electric telescopic rod 403 is connected to the drive The first connecting column 405 is connected to the clamping seat 406 at one side of the driving box 404, and the other side of the driving box 404 is connected to the clamping seat 406 through the first connecting column 405. A first driving motor 4041 is installed in the middle of the back of the driving box 404, and the output end of the first driving motor 4041 passes through the driving box 404 and is connected to one end of the gear set 4042. At the same time, the other end of the gear set 4042 is meshed with the first threaded rod 4043. The first threaded rod 4043 passes through one side of the driving box 404 and is threadedly connected to the threaded hole opened inside the first connecting column 405. The back of the first connecting column 405 is close to the driving A first movable plate 408 is installed on one side of the box 404, and the first movable plate 408 is slidably connected to the first fixed rod 409 set between the clamping seat 406 and the driving box 404. At the same time, one end of the first fixed rod 409 is fixed on the driving box 404. The first movable plate 408 moves on the first fixed rod 409, which effectively improves the stability of the movement of the first connecting column 405. The middle of one side of the clamping seat 406 is an arc structure, and adhesive pads 407 are equidistantly installed inside the arc structure, which effectively improves the tightness of the connection between the clamping seat 406 and the valve body.

[0031] When in use, the drive box 404 is pushed to move toward the middle side by the electric telescopic rod 403, and then the first drive motor 4041 is started to drive the gear set 4042 to rotate, so that the other end of the first threaded rod 4043 meshing with the gear set 4042 pushes the first fixed rod 409 to move toward the middle side, so that the adhesive pad 407 arranged on the inner side of the clamping seat 406 fits with the side of the valve body, so that the valve seat clamping limit is fixed between the two clamping seats 406.

[0032] Further explanation: the cavity arranged in the middle of the upper end of the frame body 1 and the middle of the lower end of the operating table 2 is the waste storage chamber 101, and dust baffles 102 are installed on both sides of the front of the waste storage chamber 101 through fixing screws, so as to shield the waste chips stored in the waste storage chamber 101 and prevent them from being blown out and causing pollution to the working space. At the same time, a movable through groove 201 is opened in the middle of the operating table 2, and the movable through groove 201 is located above the waste storage chamber 101, so as to facilitate the waste chips to enter the waste storage chamber 101 for storage, and screw structures 3 are symmetrically arranged on both sides of the movable through groove 201, and the two screw structures 3 are connected to both sides of the lower end of the mobile base 401. Through the screw structure 3, the position of the mobile base 401 can be adjusted conveniently, so as to facilitate the feeding and unloading of materials and improve the accuracy of the operating position.

[0033] according to Figure 1 , Figure 2 , Figure 3 and Figure 8 As shown, a protective frame 5 is installed on the outer side of the upper end of the operating table 2, and a tapping mechanism 7 is installed in the middle of the upper end of the protective frame 5. At the same time, the tapping mechanism 7 is located above the middle of the movable clamping mechanism 4. A control box 9 is installed on the back of the protective frame 5, and a control device is arranged inside the control box 9. At the same time, the control device is electrically connected to a control panel arranged in a groove opened inside one side of the protective frame 5, so as to facilitate operation by the staff.

[0034] Specifically, the tapping mechanism 7 includes an installation and fixing frame 701, a second drive motor 702, a second threaded rod 703, a second connecting column 704, a fixing bracket 705, a third drive motor 708 and a tapping head 709. The installation and fixing frame 701 is installed at the upper end of the protective frame 5, and the second drive motor 702 is installed in the middle of the lower end of the protective frame 5. At the same time, the output end of the second drive motor 702 is connected to the second threaded rod 703, and the lower end of the second threaded rod 703 is threadedly connected to a threaded hole opened in the middle of the second connecting column 704, and a fixing bracket 705 is installed at the lower end of the second connecting column 704. At the same time, the third drive motor 708 is installed in the middle of the lower end of the fixing bracket 705, and the tapping head 709 is installed at the output end of the third drive motor 708.

[0035] When in use, the second threaded rod 703 is driven to rotate by the second driving motor 702, so that the second connecting column 704 threadedly connected to the lower end of the second threaded rod 703 pushes the fixed bracket 705 to move downward, so that the tip of the tapping head 709 contacts the surface of the tapping position of the valve seat, and then the third driving motor 708 is started to drive the tapping head 709 to rotate. At the same time, the second driving motor 702 continues to drive the second threaded rod 703 to rotate, so that the tapping head 709 rotates to the inside of the valve seat for tapping. After the operation is completed, the tapping head 709 is driven to rotate in the opposite direction by the third driving motor 708. At the same time, the second driving motor 702 drives the second threaded rod 703 to rotate in the opposite direction, so that the second connecting column 704 pulls the fixed bracket 705 to move upward, so that the tapping head 709 is separated from the valve seat, and the tapping process is completed.

[0036] To further illustrate, second movable plates 706 are symmetrically installed on both sides of the second connecting column 704, and the two second movable plates 706 are slidably connected to the corresponding second fixed rods 707. The upper ends of the second fixed rods 707 are connected to the inner sides of the upper end of the mounting fixed frame 701, and the lower ends of the second fixed rods 707 pass through the fixed bracket 705 and are connected to the limit block. The second movable plates 706 move on the second fixed rods 707, which facilitates improving the stability of the movement of the fixed bracket 705.

[0037] according to Figure 1 , Figure 2 and Figure 4 As shown, a loading and unloading mechanism 8 is installed on the front side of the interior of the protective frame 5, and fixed fans 6 are symmetrically and obliquely arranged on both sides between the loading and unloading mechanism 8 and the tapping mechanism 7, so as to facilitate the cleaning of iron filings generated when the workpiece is tapped, thereby improving the cleanliness of the surface of the operating table 2 and the movable base 401.

[0038] Specifically, the loading and unloading mechanism 8 includes a sliding frame 801, a driving belt 802, a moving seat 803, an electric push rod 804 and a mechanical claw 805. The two ends of the sliding frame 801 are connected to the two sides inside the protective frame 5, and the moving seat 803 is installed on the sliding frame 801. At the same time, the moving seat 803 is connected to the driving belt 802 set on the sliding frame 801. A plurality of electric push rods 804 are set at the bottom of the lower end of the moving seat 803, and the output end of the electric push rod 804 is connected to the upper end of the mechanical claw 805.

[0039] When in use, the driving belt 802 drives the movable seat 803 to move horizontally on the sliding frame 801, so that the mechanical claw 805 is located above the middle of the two clamping seats 406, and then the electric push rod 804 is started to push the mechanical claw 805 down, so that the valve seat grasped by the mechanical claw 805 can be placed between the two clamping seats 406 to complete the valve seat loading. Conversely, the dynamic push rod 804 is started to push the mechanical claw 805 down, so that the mechanical claw 805 can grasp the processed valve seat, and then the driving belt 802 drives the movable seat 803 to move horizontally in the opposite direction on the sliding frame 801, thereby completing the unloading of the processed valve seat.

[0040] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0041] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve seat tapping machine with automatic loading and unloading, comprising a frame body (1), characterized in that: An operating table (2) is arranged at the upper end of the frame body (1), and a mobile clamping mechanism (4) is slidably connected to the middle of the upper end of the operating table (2), and the mobile clamping mechanism (4) comprises a mobile base (401), a vertical plate (402), an electric telescopic rod (403), a drive box (404), a first connecting column (405) and a clamping seat (406). Slide seats are symmetrically arranged on both sides of the lower end of the mobile base (401), and the slide seats are slidably connected to linear guide rails installed inside the upper end of the operating table (2). Vertical plates (402) are symmetrically arranged on both sides of the upper end of the mobile base (401), and electric telescopic rods (403) are symmetrically arranged on opposite sides of the two vertical plates (402), and the output end of the electric telescopic rod (403) is connected to one side of the drive box (404), and the other side of the drive box (404) is connected to the clamping seat (406) through the first connecting column (405); A protective frame (5) is installed on the outer side of the upper end of the operating table (2), and a tapping mechanism (7) is installed in the middle of the upper end of the protective frame (5). The tapping mechanism (7) is located above the middle of the movable clamping mechanism (4). A loading and unloading mechanism (8) is installed on the front side of the protective frame (5), and fixed fans (6) are symmetrically and obliquely arranged on both sides between the loading and unloading mechanism (8) and the tapping mechanism (7).

2. The valve seat tapping machine with automatic loading and unloading as claimed in claim 1, characterized in that: The cavity arranged in the middle of the upper end of the frame body (1) and the middle of the lower end of the operating table (2) is a waste storage chamber (101), and dust baffles (102) are installed on both sides of the front of the waste storage chamber (101) by fixing screws. At the same time, a movable through slot (201) is opened in the middle of the operating table (2), and the movable through slot (201) is located above the waste storage chamber (101). Screw rod structures (3) are symmetrically arranged on both sides of the movable through slot (201), and two screw rod structures (3) are connected to both sides of the lower end of the movable base (401).

3. The valve seat tapping machine with automatic loading and unloading as claimed in claim 1, characterized in that: The movable base (401) has first slideways (4011) symmetrically provided on both sides of the middle of the upper end, and the first slideway (4011) is connected to the bottom of a first self-locking roller arranged at the lower end of the driving box (404); the movable base (401) has second slideways (4012) symmetrically provided on the front and rear sides of the upper end, and the second slideways (4012) are respectively connected to the bottom of a second self-locking roller arranged on both sides of the lower end of the clamping seat (406).

4. The valve seat tapping machine with automatic loading and unloading as claimed in claim 1, characterized in that: A first driving motor (4041) is installed in the middle of the back side of the driving box (404), and the output end of the first driving motor (4041) passes through the driving box (404) and is connected to one end of the gear set (4042), while the other end of the gear set (4042) is meshedly connected to the first threaded rod (4043), and the first threaded rod (4043) passes through one side of the driving box (404) and is threadedly connected to a threaded hole opened inside the first connecting column (405).

5. The valve seat tapping machine with automatic loading and unloading as claimed in claim 1, characterized in that: A first movable plate (408) is installed on the back side of the first connecting column (405) close to the driving box (404), and the first movable plate (408) is slidably connected to a first fixed rod (409) arranged between the clamping seat (406) and the driving box (404), and one end of the first fixed rod (409) is fixed on the driving box (404). The middle of one side of the clamping seat (406) is an arc structure, and adhesive pads (407) are equidistantly installed inside the arc structure.

6. The valve seat tapping machine with automatic loading and unloading as claimed in claim 1, characterized in that: A control box (9) is installed on the back of the protection frame (5), and a control device is arranged inside the control box (9). The control device is electrically connected to a control panel arranged in a groove opened inside one side of the protection frame (5).

7. The valve seat tapping machine with automatic loading and unloading as claimed in claim 1, characterized in that: The tapping mechanism (7) comprises a mounting bracket (701), a second drive motor (702), a second threaded rod (703), a second connecting column (704), a fixing bracket (705), a third drive motor (708) and a tapping tool head (709); the mounting bracket (701) is mounted on the upper end of the protection frame (5); the second drive motor (702) is mounted in the middle of the lower end of the protection frame (5); the output end of the second drive motor (702) is connected to the second threaded rod (703); the lower end of the second threaded rod (703) is threadedly connected to a threaded hole provided in the middle of the second connecting column (704); the lower end of the second connecting column (704) is mounted with a fixing bracket (705); the lower end of the fixing bracket (705) is mounted with a third drive motor (708) in the middle of the lower end; and the output end of the third drive motor (708) is mounted with a tapping tool head (709).

8. The valve seat tapping machine with automatic loading and unloading as claimed in claim 7, characterized in that: The second connecting column (704) is symmetrically provided with second movable plates (706), and the two second movable plates (706) are slidably connected to corresponding second fixed rods (707), the upper ends of the second fixed rods (707) are connected to the inner sides of the upper end of the mounting fixed frame (701), and the lower ends of the second fixed rods (707) pass through the fixed bracket (705) and are connected to the limit block.

9. The valve seat tapping machine with automatic loading and unloading as claimed in claim 1, characterized in that: The loading and unloading mechanism (8) comprises a sliding frame (801), a driving belt (802), a moving seat (803), an electric push rod (804) and a mechanical claw (805); the two ends of the sliding frame (801) are connected to the two sides inside the protective frame (5); the moving seat (803) is installed on the sliding frame (801); the moving seat (803) is connected to the driving belt (802) arranged on the sliding frame (801); a plurality of electric push rods (804) are arranged at the bottom of the lower end of the moving seat (803); and the output end of the electric push rod (804) is connected to the upper end of the mechanical claw (805).

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