Anti-oxidation forge piece surface treatment machining device

Abstract

The utility model discloses an anti-oxidation forge piece surface treatment machining device, which belongs to the technical field of metal machining, and is characterized by comprising a pretreatment chamber, the right side of the pretreatment chamber is fixedly connected with a vacuum chamber, and a pretreatment assembly is arranged in the pretreatment chamber; a processing assembly is arranged in the vacuum chamber, the pretreatment assembly comprises a storage box fixedly connected to the top of the pretreatment chamber, the outer side of the storage box communicates with a water inlet pipe, and the top of the pretreatment chamber is fixedly connected with a conveying pump; the problems that an existing anti-oxidation forge piece surface treatment machining device is not thorough in cleaning due to the fact that impurities and oil stains on the surface of a forge piece are inconvenient to comprehensively and efficiently clean, impurities and oil stains are left on the surface of the forge piece, targeted adjustment is inconvenient to conduct according to materials and treatment requirements of different forge pieces, the treatment effect is poor, and the machining efficiency is poor can be solved. And the production quality is influenced.

Description

Technical Field

[0001] This utility model relates to the field of metal processing technology, and in particular to an anti-oxidation forging surface treatment processing device. Background Technology

[0002] During the forging process, forgings are usually exposed to high-temperature environments and undergo oxidation reactions with oxygen in the air, forming oxide scale on their surface. This not only affects the appearance quality of the forgings but also reduces their corrosion resistance, wear resistance, and other properties, thereby shortening their service life. In the forging of crankshafts for automobile engines, the presence of oxide scale may increase the surface roughness of the crankshaft, affecting its fitting accuracy with other components and reducing the overall performance of the engine.

[0003] In existing finishing machines, abrasive is placed in the finishing disc, and then the forging is placed in the finishing disc. The finishing disc vibrates to polish and deburr the forging. However, during the polishing process, particles and forgings in the finishing disc are easily thrown out, causing the ground to get dirty. The thrown forgings are also easily damaged, increasing processing costs. To address this, we propose a surface treatment device for forging production.

[0004] The existing patent (publication number: CN214771269U) discloses a surface treatment device for forging production and processing. Through the design of the blocking mechanism, the ring can be installed on the finishing plate as needed during use. The ring can prevent the abrasive and forging in the finishing plate from being easily thrown out, thereby reducing processing costs. It is easy to install, simple to operate, and improves the performance of the finishing machine.

[0005] To address the aforementioned issues, existing patents offer solutions. However, existing anti-oxidation forging surface treatment devices are not convenient for thoroughly and efficiently cleaning impurities and oil stains from the forging surface, resulting in incomplete cleaning. This leaves impurities and oil stains on the forging surface, affecting the subsequent anti-oxidation treatment effect. Furthermore, they are not convenient for targeted adjustments based on the material and processing requirements of different forgings, leading to poor treatment results and impacting production quality.

[0006] Therefore, an anti-oxidation surface treatment processing device for forgings is proposed. Utility Model Content

[0007] The purpose of this invention is to provide an anti-oxidation forging surface treatment device that solves the problems of existing anti-oxidation forging surface treatment devices, which are not convenient for thoroughly and efficiently cleaning impurities and oil stains on the surface of forgings, resulting in incomplete cleaning and residual impurities and oil stains on the surface of forgings, affecting the effect of subsequent anti-oxidation treatment. In addition, it is not convenient to make targeted adjustments according to the material and processing requirements of different forgings, resulting in poor processing effect and affecting production quality.

[0008] To achieve the above objectives, this utility model provides the following technical solution: an anti-oxidation forging surface treatment processing device, comprising a pretreatment chamber, a vacuum chamber fixedly connected to the right side of the pretreatment chamber, a pretreatment component disposed inside the pretreatment chamber, and a processing component disposed inside the vacuum chamber;

[0009] The pretreatment assembly includes a storage tank fixedly connected to the top of the pretreatment chamber. A water inlet pipe is connected to the outside of the storage tank. A delivery pump is fixedly connected to the top of the pretreatment chamber. The water inlet of the delivery pump is connected to the storage tank. The output end of the delivery pump is connected to a pipe. A nozzle assembly is connected to the bottom of the pipe. A support plate is slidably connected to the bottom of the pretreatment chamber. A drainage groove is provided on the top of the support plate. A rotating worktable is fixedly connected to the top of the support plate. A positioning fixture is provided on the top of the rotating worktable.

[0010] Preferably, the processing assembly includes a vacuum pump fixedly connected to the top of the vacuum chamber, the output end of the vacuum pump being connected to a vacuum tube, the vacuum tube being connected to the vacuum chamber, and a vapor deposition material storage tank being fixedly connected to the top of the vacuum chamber.

[0011] Preferably, the bottom of the vapor deposition material storage tank is connected to a connecting pipe, the bottom of the connecting pipe is connected to a vapor deposition nozzle, and an electromagnetic induction coil is provided on the top side inside the vacuum chamber.

[0012] Preferably, a rotating tray is fixedly connected to the bottom side of the vacuum chamber, and the rotating tray is located at the bottom of the electromagnetic induction coil.

[0013] Preferably, a fixed base is fixedly connected to the left side of the pretreatment chamber, an electric push rod is fixedly connected to the top of the fixed base, a placement seat is fixedly connected to the output end of the electric push rod, a motor body is fixedly connected to the outer side of the placement seat, a pulley is fixedly connected to the output end of the motor body, and a brush is fixedly connected to the inner side of the pulley.

[0014] Preferably, a waste collection tank is fixedly connected inside the pretreatment chamber, and a drain pipe is connected inside the waste collection tank. An electromagnetic control valve is installed on the outside of the drain pipe.

[0015] Preferably, a controller is provided on the outside of the vacuum chamber, and the controller is electrically connected to the electromagnetic induction coil.

[0016] Preferably, a mounting base is fixedly connected to the outer side of the rotary table, a positioning plate is slidably connected to the top of the mounting base, the positioning plate is fixedly connected to the positioning fixture, and a positioning pin is inserted into the outer side of the mounting base, the positioning pin engaging with the positioning plate.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This application can effectively dissolve and rinse away impurities and oil stains on the surface of forgings through the pretreatment components. Moreover, during the rotation of the forgings by the rotating worktable, the cleaning fluid can be fully covered by the forgings, which greatly improves the cleaning effect and provides a clean surface foundation for subsequent processing.

[0019] 2. This application combines electromagnetic induction heating technology with vapor deposition technology through processing components, and completes the heating of forgings and the deposition of anti-oxidation coatings in a vacuum chamber, thereby simplifying the process flow and improving production efficiency. At the same time, since the processing is carried out in a vacuum environment, interference from impurities such as oxidation is avoided, and high-quality anti-oxidation coatings can be obtained. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of an anti-oxidation forging surface treatment processing device according to the present invention;

[0021] Figure 2 This is a cross-sectional view of the pretreatment component of this utility model;

[0022] Figure 3 This is a cross-sectional view of the processing component of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the fixing base of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the waste collection tank of this utility model;

[0025] Figure 6 This is a schematic diagram of the positioning fixture of this utility model.

[0026] In the diagram, 1. Pretreatment chamber; 2. Fixture; 3. Electric push rod; 4. Pretreatment assembly; 401. Storage tank; 402. Water inlet pipe; 403. Transfer pump; 404. Pipeline; 405. Nozzle assembly; 406. Support plate; 407. Drainage trough; 408. Rotary worktable; 409. Positioning fixture; 5. Processing assembly; 501. Vacuum pump; 502. Vacuum tube; 503. Vacuum deposition material storage tank; 504. Connecting pipe; 505. Vacuum deposition nozzle; 506. Electromagnetic induction coil; 507. Rotary tray; 6. Placement seat; 7. Motor body; 8. Pulley; 9. Brush; 10. Waste collection tank; 11. Drainage pipe; 12. Electromagnetic control valve; 13. Controller; 14. Vacuum chamber; 15. Mounting seat; 16. Positioning plate; 17. Positioning pin. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-6 The present invention provides the following technical solution:

[0029] An anti-oxidation forging surface treatment processing device includes a pretreatment chamber 1, a vacuum chamber 14 fixedly connected to the right side of the pretreatment chamber 1, a pretreatment component 4 disposed inside the pretreatment chamber 1, and a processing component 5 disposed inside the vacuum chamber 14.

[0030] The pretreatment component 4 includes a storage tank 401 fixedly connected to the top of the pretreatment chamber 1. A water inlet pipe 402 is connected to the outside of the storage tank 401. A delivery pump 403 is fixedly connected to the top of the pretreatment chamber 1. The water inlet end of the delivery pump 403 is connected to the storage tank 401. The output end of the delivery pump 403 is connected to a pipe 404. A nozzle assembly 405 is connected to the bottom of the pipe 404. A support plate 406 is slidably connected to the bottom of the pretreatment chamber 1. A drainage groove 407 is provided on the top of the support plate 406. A rotating worktable 408 is fixedly connected to the top of the support plate 406. A positioning clamp 409 is provided on the top of the rotating worktable 408.

[0031] In this embodiment: by pulling the support plate 406, the top rotary table 408 is moved. The forging to be processed is then placed on top of the rotary table 408. Next, the distance between the positioning fixture 409 and the forging to be processed is adjusted. First, the positioning pin 17 is removed to release the fixation between the positioning plate 16 and the mounting base 15. Then, the positioning plate 16 is slid on top of the mounting base 15. After adjustment, the positioning pin 17 is reinserted into the fixing hole of the mounting base 15 to re-fix the mounting base 15 and the positioning plate 16. Then, the positioning fixture 409 is clamped and fixed to the forging to be processed. Finally, the fixed forging... The workpiece is pushed back into the pretreatment chamber 1 by the support plate 406. Then the delivery pump 403 is started, and the delivery pump 403 extracts the cleaning fluid from the storage tank 401 and delivers it to the nozzle assembly 405 through the pipeline 404. The nozzle assembly 405 is located above the interior of the pretreatment chamber 1 and can spray the cleaning fluid evenly on the surface of the forging. The cleaning fluid can remove impurities and oil stains from the surface of the forging. At the same time, the rotating worktable 408 is started, and the rotating worktable 408 can drive the forging to rotate, so that the cleaning fluid can more comprehensively cover the surface of the forging to improve the cleaning effect. During the cleaning, the wastewater generated during the cleaning flows into the waste collection tank 10 through the drainage trough 407.

[0032] Specifically, such as Figure 3 As shown, the processing component 5 includes a vacuum pump 501 fixedly connected to the top of the vacuum chamber 14. The output end of the vacuum pump 501 is connected to a vacuum tube 502, which is connected to the vacuum chamber 14. A vapor deposition material storage tank 503 is fixedly connected to the top of the vacuum chamber 14.

[0033] Specifically, such as Figure 3 As shown, the bottom of the vapor deposition material storage tank 503 is connected to a connecting pipe 504, the bottom of the connecting pipe 504 is connected to a vapor deposition nozzle 505, and an electromagnetic induction coil 506 is provided on the top side inside the vacuum chamber 14.

[0034] Specifically, such as Figure 3 As shown, a rotating tray 507 is fixedly connected to the bottom side inside the vacuum chamber 14, and the rotating tray 507 is located at the bottom of the electromagnetic induction coil 506.

[0035] In this embodiment: the pre-treated forging is placed on a rotating tray 507 inside the vacuum chamber 14. The rotating shaft at the bottom of the rotating tray 507 is connected to a drive motor, which is installed at the bottom of the vacuum chamber 14 and can drive the rotating tray 507 to rotate smoothly inside the vacuum chamber 14. The rotating tray 507 is made of a high-temperature resistant and corrosion-resistant material, while the vacuum chamber 14 is made of stainless steel and has good sealing properties. Then, the vacuum pump 501 is started, and the vacuum pump 501 evacuates the vacuum chamber 14 to a vacuum state through the vacuum tube 502 to 404. Then, according to preset temperature parameters, the heating temperature of the forging is precisely adjusted by controlling the current magnitude and frequency of the electromagnetic induction coil 506. Then, its electromagnetic induction... The coil 506 generates an alternating magnetic field, which induces a current in the forging placed on the rotating tray 507 below, thereby heating it up. At the same time, the drive motor at the bottom of the rotating tray 507 is activated. During the heating and vapor deposition process, the rotational coordination between the drive motor and the rotating tray 507 ensures that the forging is heated evenly. When the forging reaches the appropriate processing temperature, the vapor deposition nozzle 505 is turned on. The vapor deposition material storage tank 503 is equipped with a heating device. Then, under the heating action of the heating device, the material inside is turned into a gaseous state. Then, it is evenly sprayed onto the surface of the forging through the vapor deposition nozzle 505. With the continuous rotation of the rotating tray 507, the gaseous material is deposited on the surface of the forging, forming a uniform and dense anti-oxidation coating.

[0036] Specifically, such as Figure 4 As shown, a fixed base 2 is fixedly connected to the left side of the pretreatment chamber 1, an electric push rod 3 is fixedly connected to the top of the fixed base 2, a placement seat 6 is fixedly connected to the output end of the electric push rod 3, a motor body 7 is fixedly connected to the outside of the placement seat 6, a pulley 8 is fixedly connected to the output end of the motor body 7, and a brush 9 is fixedly connected to the inside of the pulley 8.

[0037] Specifically, such as Figure 5 As shown, a waste collection tank 10 is fixedly connected inside the pretreatment chamber 1, and a drain pipe 11 is connected inside the waste collection tank 10. An electromagnetic control valve 12 is installed on the outside of the drain pipe 11.

[0038] In this embodiment: By setting up a fixed seat 2, an electric push rod 3, a placement seat 6, a motor body 7, a pulley 8, and a brush 9, during the pretreatment cleaning of the forging, the electric push rod 3 on the fixed seat 2 on the left side of the pretreatment chamber 1 starts to work. Then, the electric push rod 3 extends according to the operator's instructions, pushing the placement seat 6 connected to it closer to the forging on the rotary table 408. When the placement seat 6 moves to the appropriate position, the motor body 7 is started. Then, the output shaft of the motor body 7 drives the pulley 8 to rotate. Since the brush 9 is fixedly connected to the inner side of the pulley 8, the brush 9 starts to rotate. The rotating brush 9 mechanically cleans the surface of the forging. Through the friction between the brush bristles and the surface of the forging, the cleaning fluid removes the residue that was removed after cleaning. Stubborn impurities and oxide scale remaining on the surface of the forging are removed after cleaning. The electric push rod 3 retracts, moving the placement seat 6 and brush 9 away from the forging. During the cleaning and mechanical cleaning of the forging in the pretreatment chamber 1, the wastewater generated during cleaning and the removed impurities flow with the water flow through the drainage channel 407 opened at the top of the support plate 406 into the wastewater collection tank 10 fixedly connected inside the pretreatment chamber 1. When it is necessary to discharge wastewater, the operator can open the electromagnetic control valve 12, and then the wastewater will be discharged from the wastewater collection tank 10 through the drainage pipe 11 and enter the subsequent wastewater treatment system for treatment.

[0039] Specifically, such as Figure 1 As shown, a controller 13 is provided on the outside of the vacuum chamber 14, and the controller 13 is electrically connected to the electromagnetic induction coil 506.

[0040] Specifically, such as Figure 6 As shown, a mounting base 15 is fixedly connected to the outer side of the rotary worktable 408, and a positioning plate 16 is slidably connected to the top of the mounting base 15. The positioning plate 16 is fixedly connected to the positioning fixture 409, and a positioning pin 17 is inserted into the outer side of the mounting base 15. The positioning pin 17 is engaged with the positioning plate 16.

[0041] In this embodiment: By setting up a controller 13, when heating and performing vapor deposition on the forging in the vacuum chamber 14, the operator inputs the corresponding temperature parameters on the controller 13 outside the vacuum chamber 14 according to the material, size, and required anti-oxidation coating of the forging. After receiving the command, the controller 13 sends a control signal to the electromagnetic induction coil 506 via a data line electrically connected to the electromagnetic induction coil 506 to adjust the magnitude and frequency of the current in the electromagnetic induction coil 506. During the heating process of the forging, a temperature sensor connected to the controller 13 and located inside the vacuum chamber 14 monitors the temperature inside the vacuum chamber 14 in real time and feeds the temperature data back to the controller 13. The controller 13 then compares the feedback data with the preset temperature and continuously adjusts the current of the electromagnetic induction coil 506 to ensure that the forging can stably reach and maintain a suitable processing temperature. This provides accurate heating conditions for the forging according to different process requirements, ensuring that the surface temperature of the forging remains stable during the vapor deposition process. To ensure stability, the mounting base 15, positioning plate 16, and positioning pin 17 are provided. When placing the forging onto the rotary table 408, if forgings of different sizes and shapes are encountered, the position of the positioning fixture 409 needs to be adjusted. First, the operator pulls the positioning pin 17 out of the insertion hole on the outside of the mounting base 15, releasing the fixed constraint between the positioning plate 16 and the mounting base 15. Then, the positioning plate 16 is slid on the top of the mounting base 15. Since the positioning plate 16 is fixedly connected to the positioning fixture 409, The positioning fixture 409 also moves accordingly. The operator adjusts the positioning fixture 409 to a suitable position according to the actual situation of the forging, so that the positioning fixture 409 can firmly hold the forging. After the adjustment is completed, the positioning pin 17 is reinserted into the corresponding insertion hole on the outside of the mounting base 15, so that the positioning pin 17 is engaged with the positioning plate 16, thereby fixing the position of the positioning plate 16 and the positioning fixture 409, ensuring that the forging can be accurately positioned and stably fixed on the rotary table 408 in the subsequent pre-processing process.

[0042] Working Principle: In the process of using the anti-oxidation forging surface treatment device, firstly, alkaline cleaning solution is added into the storage tank 401 through the water inlet pipe 402. Then, the protective door outside the pretreatment chamber 1 is opened. Next, the support plate 406 is pulled, causing the top rotating worktable 408 to move. The forging to be processed is then placed on top of the rotating worktable 408. Next, the distance between the positioning fixture 409 and the forging to be processed is adjusted. First, the positioning pin 17 is removed to release the fixation between the positioning plate 16 and the mounting base 15. Then, the positioning plate 16 is slid on top of the mounting base 15. After adjustment, the positioning pin 17 is reinserted into the fixing hole of the mounting base 15 to re-align the mounting base 15 and the positioning fixture. Plate 16 is re-fixed, and then the positioning fixture 409 is clamped and fixed to the forging to be processed. Afterwards, the fixed forging is pushed back into the pretreatment chamber 1 by pushing the support plate 406. Then, the delivery pump 403 is started, drawing cleaning fluid from the storage tank 401 and delivering it through pipe 404 to the nozzle assembly 405. The nozzle assembly 405 is located above the interior of the pretreatment chamber 1, allowing the cleaning fluid to be evenly sprayed onto the surface of the forging. The cleaning fluid can remove impurities and oil stains from the surface of the forging. Simultaneously, the rotating worktable 408 is started, causing the forging to rotate, allowing the cleaning fluid to more comprehensively cover the surface of the forging, thus improving the cleaning effect. During cleaning, the generated contaminants... Water flows into the waste collection tank 10 through the drainage trough 407. The waste collection tank 10 is located at the bottom of the support plate 406. The sewage discharge from the waste collection tank 10 can be controlled by the electromagnetic control valve 12. During the cleaning process, the electric push rod 3 is activated, which pushes the placement seat 6 and brush 9 closer to the forging. Then, the motor body 7 is activated, which drives the two brushes 9 to rotate synchronously through the pulley 8 to mechanically clean the surface of the forging, removing stubborn impurities and oxide scale. The pre-treated forging is then placed on the rotating tray 507 inside the vacuum chamber 14. The rotating shaft at the bottom of the rotating tray 507 is connected to the drive motor, which is installed at the bottom of the vacuum chamber 14 and can drive... The rotating pallet 507 rotates smoothly within the vacuum chamber 14. The pallet 507 is made of high-temperature and corrosion-resistant material, while the vacuum chamber 14 is made of stainless steel, ensuring excellent sealing. The vacuum pump 501 is then activated, drawing a vacuum into the chamber 14 through vacuum tubes 502 and 404. Following preset temperature parameters, the heating temperature of the forging is precisely adjusted by controlling the current and frequency of the electromagnetic induction coil 506. The electromagnetic induction coil 506 generates an alternating magnetic field, inducing a current in the forging placed on the rotating pallet 507, thus heating it. Simultaneously, the drive motor at the bottom of the rotating pallet 507 is activated. During the heating and vapor deposition process…The rotational coordination between the drive motor and the rotating tray 507 ensures uniform heating of the forging. Once the forging reaches the appropriate processing temperature, the vapor deposition nozzle 505 is activated. The vapor deposition material storage tank 503 is equipped with a heating device. Under the heating effect of this device, the material inside is converted into a gaseous state and then uniformly sprayed onto the surface of the forging through the vapor deposition nozzle 505. With the continuous rotation of the rotating tray 507, the gaseous material is deposited on the surface of the forging, forming a uniform and dense anti-oxidation coating.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An anti-oxidation forging surface treatment apparatus, comprising a pretreatment chamber (1), characterized in that: A vacuum chamber (14) is fixedly connected to the right side of the pretreatment chamber (1). A pretreatment component (4) is provided inside the pretreatment chamber (1), and a processing component (5) is provided inside the vacuum chamber (14). The pretreatment component (4) includes a storage tank (401) fixedly connected to the top of the pretreatment chamber (1). The outside of the storage tank (401) is connected to a water inlet pipe (402). The top of the pretreatment chamber (1) is fixedly connected to a delivery pump (403). The water inlet of the delivery pump (403) is connected to the storage tank (401). The output end of the delivery pump (403) is connected to a pipe (404). The bottom of the pipe (404) is connected to a nozzle assembly (405). The bottom of the pretreatment chamber (1) is slidably connected to a support plate (406). The top of the support plate (406) is provided with a drainage groove (407). The top of the support plate (406) is fixedly connected to a rotating worktable (408). The top of the rotating worktable (408) is provided with a positioning fixture (409).

2. The anti-oxidation forging surface treatment device according to claim 1, characterized in that: The processing assembly (5) includes a vacuum pump (501) fixedly connected to the top of the vacuum chamber (14), the output end of the vacuum pump (501) is connected to a vacuum tube (502), the vacuum tube (502) is connected to the vacuum chamber (14), and a vapor deposition material storage tank (503) is fixedly connected to the top of the vacuum chamber (14).

3. The anti-oxidation forging surface treatment apparatus according to claim 2, characterized in that: The bottom of the vapor deposition material storage tank (503) is connected to a connecting pipe (504), the bottom of the connecting pipe (504) is connected to a vapor deposition nozzle (505), and an electromagnetic induction coil (506) is provided on the top side inside the vacuum chamber (14).

4. The anti-oxidation forging surface treatment apparatus according to claim 3, characterized in that: A rotating tray (507) is fixedly connected to the bottom side inside the vacuum chamber (14), and the rotating tray (507) is located at the bottom of the electromagnetic induction coil (506).

5. The anti-oxidation forging surface treatment apparatus according to claim 1, characterized in that: A fixed seat (2) is fixedly connected to the left side of the pretreatment chamber (1). An electric push rod (3) is fixedly connected to the top of the fixed seat (2). A placement seat (6) is fixedly connected to the output end of the electric push rod (3). A motor body (7) is fixedly connected to the outside of the placement seat (6). A pulley (8) is fixedly connected to the output end of the motor body (7). A brush (9) is fixedly connected to the inside of the pulley (8).

6. The anti-oxidation forging surface treatment apparatus according to claim 1, characterized in that: The pretreatment chamber (1) is fixedly connected to a waste collection tank (10), and the waste collection tank (10) is connected to a drain pipe (11). An electromagnetic control valve (12) is provided on the outside of the drain pipe (11).

7. The anti-oxidation forging surface treatment apparatus according to claim 3, characterized in that: A controller (13) is provided on the outside of the vacuum chamber (14), and the controller (13) is electrically connected to the electromagnetic induction coil (506).

8. The anti-oxidation forging surface treatment apparatus according to claim 1, characterized in that: A mounting base (15) is fixedly connected to the outer side of the rotary worktable (408). A positioning plate (16) is slidably connected to the top of the mounting base (15). The positioning plate (16) is fixedly connected to the positioning fixture (409). A positioning pin (17) is inserted into the outer side of the mounting base (15). The positioning pin (17) is engaged with the positioning plate (16).

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