Machining center for explosive-proof device production

Abstract

The invention discloses a machining center for explosive-proof device production, which belongs to the technical field of metal cutting and forming machine tools, and comprises a milling machine body, a working table arranged above the milling machine body, a machining table vertically fixed on one side of the milling machine body, and a main shaft assembly arranged on the side surface of the machining table, the main shaft assembly comprises a universal ball head and a cutter handle used for installing a cutting tool, the main shaft assembly is connected with a machining machine table through a cross roller guide rail and driven by a servo motor to achieve multi-shaft linkage, a triple positioning clamp is arranged on the working table, and an outer cover assembly of an explosion-proof device is clamped on the inner side of the triple positioning clamp. The triple positioning clamp comprises a magnetic adsorption clamp located at the connecting end of the outer cover assembly, a modular profiling clamp located in the middle section of the outer portion of the outer cover assembly and a pressure induction clamp located at the tail end of the outer cover assembly. The magnetic adsorption clamp, the modular profiling clamp and the pressure induction clamp of the triple positioning clamp achieve synchronous clamping action through the main control system. The clamping device has the advantages of being good in complex curved surface clamping effect, capable of achieving self-adaption of clamping force and thorough in dynamic scrap restraining effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal cutting and forming machine tools, and particularly relates to a machining center for the production of explosion-proof devices. Background Art

[0002] As a key component, the outer cover assembly of the explosion-proof device directly affects the equipment sealing performance and explosion resistance performance. Usually, the flame cutting method is adopted for the blanking work of the shell material, and then the raw material is cut and drilled by a milling machine and a machining center, and the parts with specific dimensions are connected by welding to form the main structure of the explosion-proof shell. Common machining centers mostly use hydraulic fixtures or vacuum adsorption devices for clamping, but the outer cover assembly has complex curved surface characteristics, and the traditional chuck is prone to workpiece deformation or slippage due to uneven force application. Especially when machining the conical surface, the axial component force is difficult to cancel, the workpiece positioning stability is poor, the machining error often exceeds ±0.2 mm, and the scrap rate is as high as 15%. In addition, the thin-walled structure is extremely sensitive to the distribution of the clamping force, and the traditional rigid fixture is prone to local stress concentration, resulting in surface indentation or even cracking.

[0003] In the prior art, the clamping uniformity is improved by adding auxiliary support points, but it cannot be adapted to multi-type special-shaped parts, and the tool change time is up to more than 30 minutes, seriously affecting the production efficiency; on the other hand, during the milling process, metal chips are easily ejected and spread, polluting the machining environment and scratching the workpiece surface, and the traditional chip suction device is difficult to integrate the chip management function synchronously at the clamping station due to structural limitations.

[0004] Therefore, it is urgent to develop a machining center with high-precision positioning, adaptive clamping force adjustment and dynamic chip suppression to solve the problems of stability and cleanliness in the machining of complex curved surface workpieces and meet the strict requirements of batch production of explosion-proof devices. Summary of the Invention

[0005] The purpose of the present invention is to provide a machining center for the production of explosion-proof devices in order to solve the problems that common machining centers are difficult to stably clamp the outer cover assembly of the explosion-proof device, the positioning clamping accuracy is low, the clamping force adjustment is relatively complex, and metal chips are easily ejected and spread.

[0006] The present invention realizes the above purpose through the following technical solutions: including a milling machine bed body;

[0007] A workbench arranged above the milling machine bed body, the workbench slides on the milling machine bed body along the X-axis direction, an X-axis linear guide rail is arranged at the bottom of the workbench, and the sliding is realized by driving a ball screw through a servo motor;

[0008] The processing machine is vertically fixed to one side of the milling machine bed. The processing machine slides along the Y-axis direction on the milling machine bed. The bottom of the processing machine is provided with a Y-axis linear guide rail, which cooperates with the slider on the milling machine bed and is driven by a stepping motor;

[0009] The spindle assembly is arranged on the side of the processing machine and slides inside the processing machine along the X-axis and Z-axis directions. The spindle assembly includes a universal ball head and a tool holder for installing a cutting tool. The spindle assembly is connected to the processing machine through a crossed roller guide rail and is driven by a servo motor to achieve multi-axis linkage;

[0010] A triple positioning fixture is provided on the workbench, and the outer cover assembly of the explosion-proof device is clamped inside the triple positioning fixture;

[0011] The triple positioning fixture includes a magnetic adsorption fixture at the connection end of the outer cover assembly, a modular profiling fixture in the middle of the outside of the outer cover assembly, and a pressure induction fixture at the end of the outer cover assembly. The magnetic adsorption fixture, modular profiling fixture, and pressure induction fixture of the triple positioning fixture achieve synchronous clamping actions through the main control system.

[0012] Further, the magnetic adsorption fixture is composed of a first cylinder and a clamping disc. The first cylinder is connected to the workbench through a bracket, and the output end of the first cylinder is fixed to the outside of the clamping disc by screws.

[0013] Further, an annular groove is provided inside the clamping disc. A rod-shaped electromagnet is embedded inside the columnar protrusion in the middle of the annular groove, and an annular disc-shaped electromagnet is embedded on the inner side wall of the annular groove. The rod-shaped electromagnet and the disc-shaped electromagnet are both electrically connected to the power supply through the electrodes on the outside of the clamping disc. The electrodes are connected to the power supply through a PLC control system to achieve segmented power-on control of the rod-shaped electromagnet and the disc-shaped electromagnet.

[0014] Further, the height of the columnar protrusion is not lower than the height of the annular groove, and the diameter of the columnar protrusion does not exceed the inner hole diameter of the connection end of the outer cover assembly.

[0015] Further, the modular profiling fixture includes an annular beam frame. The bottom of the annular beam frame is connected to the workbench through a bracket. Three profiling jaws are equiangularly arranged inside the annular beam frame. Second cylinders are provided on the outside of the three profiling jaws. Guide rails are provided on both sides of the second cylinders. The profiling jaws are connected to the second cylinders through threaded quick-change interfaces to support modular replacement.

[0016] Further, the second cylinder is installed outside the annular beam frame. The output end of the second cylinder penetrates through the annular beam frame and is threadedly connected to the profiling jaw. One end of the guide rail is fixedly connected to the profiling jaw, and the other end of the guide rail penetrates through the other annular beam frame and is fixedly provided with a limiting plate at the other end.

[0017] Further, the profiling jaw is composed of a matrix skeleton, an arc transition plate, and a contact layer. The matrix skeleton is made of stainless steel material, the arc transition plate is made of gradient copper-tungsten alloy material, and the contact layer is a molybdenum disulfide embedded graphene composite coating. At least one of an array of diamond-shaped protrusions and an array of wavy grooves is provided on the surface of the arc transition plate.

[0018] Further, an arc-shaped embedding groove is provided inside the matrix skeleton. The arc transition plate is embedded inside the arc-shaped embedding groove and fixed by screws. The molybdenum disulfide embedded graphene composite coating is sprayed on the surface of the arc transition plate. The inner side surfaces of the matrix skeleton and the arc transition plate have the same curvature as the inclined end transition surface in the middle section of the outer cover assembly, so as to achieve "surface-to-surface" precise fitting.

[0019] Further, the pressure-sensing fixture includes a connecting rod. One end of the connecting rod is fixedly connected to the annular beam frame by screws. A vertical threaded cylinder is fixedly provided at the other end of the connecting rod. A profiling fitting is provided at the bottom of the threaded cylinder. The bottom of the profiling fitting has the same curvature as the inclined end transition surface at the end of the outer cover assembly. The side surface of the profiling fitting is fitted to the outer surface of the circular connecting part at the end of the outer cover assembly.

[0020] Further, a pressure sensor is installed inside the side surface of the profiling fitting and is electrically connected to the main control of the processing machine tool. An adjusting bolt is provided at the top of the profiling fitting and is connected by a rotating shaft. The adjusting bolt passes through the threaded cylinder and is connected by thread engagement. A scale disk is provided at the top of the adjusting bolt for precisely controlling the pressing displacement of the profiling fitting. The pressure sensor is set with a safety pressure threshold, and when the limit is exceeded, the main control system is triggered to stop and alarm.

[0021] Beneficial effects: The design of the present invention is reasonable and has the following beneficial effects:

[0022] 1. In the solution of the present invention, the connecting end of the outer cover assembly is precisely adsorbed by the electromagnetic segmented control of the magnetic adsorption fixture. Combining the "surface-to-surface" coincidence of the three-point profiling jaws of the modular profiling fixture and the inclined end transition surface in the middle section of the outer cover, and the end abutting and stopping and threshold feedback adjustment of the pressure-sensing fixture, the axial component force during conical surface processing is effectively offset, avoiding workpiece slippage. It is especially suitable for the stable clamping of thin-walled special-shaped parts, and can greatly improve the uniformity of the clamping force distribution and the clamping stability.

[0023] 2. In the solution of the present invention, the rod-shaped electromagnet of the magnetic adsorption fixture can continuously adsorb the metal debris generated inside the outer cover assembly during the processing, realizing the centralized recovery of the debris, reducing the spread of more than 90% of the debris, significantly improving the cleanliness of the processing environment, reducing the subsequent cleaning cost, and at the same time avoiding the secondary scratching of the workpiece surface by the debris;

[0024] 3. In the solution of the present invention, the profiling jaws of the modular profiling fixture adopt a quick-change interface design, supporting the rapid adaptation of different models of outer cover assemblies. The replacement time is shortened to within 5 minutes. The threshold alarm system of the pressure sensing fixture can real-time monitor the stress state of the end ring-shaped connecting part, automatically stop when the clamping force exceeds the limit, prevent the deformation of the thin-walled structure, and reduce the rejection rate;

[0025] 4. In the solution of the present invention, the gradient copper-tungsten alloy arc transition plate and the molybdenum disulfide graphene composite contact layer of the profiling jaws have both high thermal conductivity and wear resistance. Under the high-speed milling working condition, the friction coefficient is reduced by 35%, the thermal deformation amount is reduced by 50%, the service life of the fixture is extended to more than 8000 hours, and at the same time, the indentation damage to the workpiece surface by the traditional fixture is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is a schematic structural diagram of the milling machine bed of the present invention;

[0028] Figure 3 is a schematic structural diagram of the local part A of the present invention;

[0029] Figure 4 is a schematic structural diagram of the triple positioning fixture of the present invention;

[0030] Figure 5 is a schematic partial structural diagram of the magnetic adsorption fixture of the present invention;

[0031] Figure 6 is a schematic structural diagram of the back of the clamping disc of the present invention;

[0032] Figure 7 is an exploded view of the clamping disc structure of the present invention;

[0033] Figure 8 is a schematic structural diagram of the modular profiling fixture of the present invention;

[0034] Figure 9 is a schematic structural diagram of the profiling jaw of the present invention;

[0035] Figure 10 is a schematic structural diagram of the pressure sensing fixture of the present invention;

[0036] Figure 11 is a schematic structural diagram of the outer cover assembly of the present invention.

[0037] In the figure: 1 - milling machine bed body, 2 - triple positioning fixture, 3 - outer cover assembly;

[0038] 11 - workbench, 12 - processing machine platform, 13 - spindle assembly, 21 - magnetic adsorption fixture, 22 - modular profiling fixture, 23 - pressure sensing fixture, 31 - connection end, 32 - inclined end transition surface, 33 - circular connection part;

[0039] 131 - universal ball head, 132 - tool shank, 211 - first cylinder, 212 - clamping disc, 213 - annular groove, 214 - columnar protrusion, 215 - rod-shaped electromagnet, 216 - disc-shaped electromagnet, 217 - electrode, 221 - annular beam frame, 222 - profiling jaw, 223 - second cylinder, 224 - guide rail, 225 - limit plate, 231 - connecting rod, 232 - threaded cylinder, 233 - profiling fitting, 234 - pressure sensor, 235 - adjusting bolt;

[0040] 2221 - matrix skeleton, 2222 - arc transition plate, 2223 - contact layer, 2224 - arc embedding groove. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0043] Combined with Figures 1 to 11 A processing center for the production of explosion-proof devices as shown, including a milling machine bed body 1;

[0044] A workbench 11 arranged above the milling machine bed body 1, the workbench 11 slides on the milling machine bed body 1 along the X-axis direction, and an X-axis linear guide rail is provided at the bottom of the workbench 11, and the sliding is realized by driving a ball screw through a servo motor;

[0045] The processing machine 12 is vertically fixed to one side of the milling machine bed 1. The processing machine 12 slides on the milling machine bed 1 in the Y-axis direction. The bottom of the processing machine 12 is provided with a Y-axis linear guide rail, which cooperates with the slider on the milling machine bed 1 and is driven by a stepping motor;

[0046] The spindle assembly 13 is arranged on the side of the processing machine 12 and slides inside the processing machine 12 in the X-axis and Z-axis directions. The spindle assembly 13 includes a universal ball head 131 and a tool holder 132 for installing a cutting tool. The spindle assembly 13 is connected to the processing machine 12 through a crossed roller guide rail and is driven by a servo motor to achieve multi-axis linkage;

[0047] A triple positioning fixture 2 is provided on the workbench 11, and the outer cover assembly 3 of the explosion-proof device is clamped inside the triple positioning fixture 2;

[0048] The triple positioning fixture 2 includes a magnetic adsorption fixture 21 located at the connection end 31 of the outer cover assembly 3, a modular profiling fixture 22 located in the middle section outside the outer cover assembly 3, and a pressure sensing fixture 23 located at the end of the outer cover assembly 3. The magnetic adsorption fixture 21, the modular profiling fixture 22, and the pressure sensing fixture 23 of the triple positioning fixture 2 achieve synchronous clamping actions through the main control system.

[0049] Combined Figures 4 to 7 As shown, the magnetic adsorption fixture 21 is composed of a first cylinder 211 and a clamping disc 212. The first cylinder 211 is connected to the workbench 11 through a bracket, and the output end of the first cylinder 211 is fixed to the outside of the clamping disc 212 by screws.

[0050] Combined Figures 5 to 7 As shown, an annular groove 213 is provided inside the clamping disc 212. A rod-shaped electromagnet 215 is embedded inside a columnar protrusion 214 in the middle of the annular groove 213, and an annular disc-shaped electromagnet 216 is embedded in the inner side wall of the annular groove 213. The rod-shaped electromagnet 215 and the disc-shaped electromagnet 216 are both electrically connected to the power supply through an electrode 217 on the outside of the clamping disc 212. The electrode 217 is connected to the power supply through a PLC control system to achieve segmented power-on control of the rod-shaped electromagnet 215 and the disc-shaped electromagnet 216.

[0051] Combined Figure 7 As shown, the height of the columnar protrusion 214 is not lower than the height of the annular groove 213, and the diameter of the columnar protrusion 214 does not exceed the inner hole diameter of the connection end 31 of the outer cover assembly 3.

[0052] Combined Figure 4 And Figure 8As shown, the modular profiling fixture 22 includes an annular beam frame 221. The bottom of the annular beam frame 221 is connected to the workbench 11 through a bracket. Three profiling jaws 222 are equiangularly arranged on the inner side of the annular beam frame 221. Second cylinders 223 are arranged on the outer sides of the three profiling jaws 222. Guide rails 224 are arranged on both sides of the second cylinders 223. The profiling jaws 222 are connected to the second cylinders 223 through threaded quick-change interfaces, supporting modular replacement.

[0053] Combined with Figure 8 and Figure 9 As shown, the second cylinders 223 are installed on the outer sides of the annular beam frame 221. The output ends of the second cylinders 223 penetrate through the annular beam frame 221 and are threadedly connected to the profiling jaws 222. One end of the guide rail 224 is fixedly connected to the profiling jaw 222. After the guide rail 224 penetrates through the other end of the annular beam frame 221, a limit plate 225 is fixedly arranged at the other end.

[0054] Combined with Figure 9 As shown, the profiling jaw 222 is composed of a base skeleton 2221, an arc transition plate 2222, and a contact layer 2223. The base skeleton 2221 is made of stainless steel material, the arc transition plate 2222 is made of gradient copper-tungsten alloy material, and the contact layer 2223 is a molybdenum disulfide embedded graphene composite coating. At least one of an array of diamond-shaped protrusions and an array of wavy grooves is arranged on the surface of the arc transition plate 2222.

[0055] Combined with Figure 9 As shown, an arc embedding groove 2224 is arranged on the inner side of the base skeleton 2221. The arc transition plate 2222 is embedded inside the arc embedding groove 2224 and fixed by screws. The molybdenum disulfide embedded graphene composite coating is sprayed on the surface of the arc transition plate 2222. The inner side surfaces of the base skeleton 2221 and the arc transition plate 2222 have the same curvature as the inclined end transition surface 32 in the middle section of the outer cover assembly 3, so as to achieve "surface-to-surface" precise fitting.

[0056] Combined with Figure 4 and Figure 10 As shown, the pressure sensing fixture 23 includes a connecting rod 231. One end of the connecting rod 231 is fixedly connected to the annular beam frame 221 by screws. A vertical threaded cylinder 232 is fixedly arranged at the other end of the connecting rod 231. A profiling fitting 233 is arranged at the bottom of the threaded cylinder 232. The bottom of the profiling fitting 233 has the same curvature as the inclined end transition surface 32 at the end of the outer cover assembly 3. The side surface of the profiling fitting 233 is fitted to the outer surface of the ring-shaped connecting part 33 at the end of the outer cover assembly 3.

[0057] Combined with Figure 10As shown in the figure, a pressure sensor 234 is installed inside the side surface of the profiling fitting 233 and is electrically connected to the main control of the processing machine tool 12. An adjusting bolt 235 is provided at the top of the profiling fitting 233 and is connected by a rotating shaft. The adjusting bolt 235 passes through the threaded cylinder 232 and is connected by thread engagement. A dial is provided at the top of the adjusting bolt 235 for accurately controlling the pressing displacement of the profiling fitting 233. The pressure sensor 234 is set with a safety pressure threshold, and when the limit is exceeded, the main control system is triggered to stop and alarm.

[0058] Working principle: During the use of the present invention, the output end of the first cylinder 211 pushes the clamping disc 212 towards the connecting end 31 of the outer cover assembly 3 until the annular groove 213 engages with the outer surface of the connecting end 31, and the columnar protrusion 214 is inserted into the inner hole of the connecting end 31. The electrode 217 is connected to the power supply through the PLC control system to energize the rod-shaped electromagnet 215 and the disc-shaped electromagnet 216. The disc-shaped electromagnet 216 adsorbs the connecting end 31 to form a clamp. The output ends of the three second cylinders 223 push the profiling jaws 222 to travel in a profiling manner along the guide rail 224 until the arc transition plate 2222 and the contact layer 2223 are precisely "surface-to-surface" fitted with the inclined end transition surface 32 in the middle section of the outer cover assembly 3. A stable clamping and limiting relationship is established through the "three-point circle determination" principle. During the clamping process of the profiling jaws 222, the magnetic adsorption fixture 21 drags the outer cover assembly 3 towards one end until the bottom surface and side surface of the profiling fitting 233 are fitted with the inclined end transition surface 32 and the outer surface of the ring-shaped connecting portion 33 of the outer cover assembly 3. The ring-shaped connecting portion 33 applies pressure to the pressure sensor 234. When the safety pressure threshold is reached, the main control system is triggered to stop the movement of the magnetic adsorption fixture 21, completing the clamping of the outer cover assembly 3;

[0059] During the milling process, the workbench 11 and the spindle assembly 13 control the positions of the tool and the outer cover assembly 3. The rod-shaped electromagnet 215 adsorbs and concentrates the metal chips generated during the milling process of the tool, facilitating subsequent cleaning and keeping the processing environment clean.

[0060] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0061] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A machining center for the production of flameproof devices, comprising a milling machine bed body (1); A workbench (11) arranged above the milling machine bed body (1), and the workbench (11) slides on the milling machine bed body (1) along the X-axis direction; A machining platform (12) vertically fixed to one side of the milling machine bed body (1), and the machining platform (12) slides on the milling machine bed body (1) along the Y-axis direction; A spindle assembly (13) arranged on the side of the machining platform (12), sliding inside the machining platform (12) along the X-axis and Z-axis directions, and the spindle assembly (13) includes a universal ball head (131) and a tool holder (132) for mounting a cutting tool; It is characterized in that: A triple positioning fixture (2) is provided on the workbench (11), and an outer cover assembly (3) of the flameproof device is clamped inside the triple positioning fixture (2); The triple positioning fixture (2) includes a magnetic adsorption fixture (21) located at the connection end (31) of the outer cover assembly (3), a modular profiling fixture (22) located in the middle section outside the outer cover assembly (3), and a pressure sensing fixture (23) located at the end of the outer cover assembly (3).

2. The machining center for the production of flameproof devices according to claim 1, wherein: The magnetic adsorption fixture (21) is composed of a first cylinder (211) and a clamping disc (212), the first cylinder (211) is connected to the workbench (11) through a bracket, and the output end of the first cylinder (211) is fixed to the outside of the clamping disc (212) by screws.

3. The machining center for the production of flameproof devices according to claim 2, characterized in that: An annular groove (213) is provided inside the clamping disc (212), a rod-shaped electromagnet (215) is embedded inside a columnar protrusion (214) in the middle of the annular groove (213), and an annular disc-shaped electromagnet (216) is embedded on the inner side wall of the annular groove (213). The rod-shaped electromagnet (215) and the disc-shaped electromagnet (216) are both electrically connected to a power supply through an electrode (217) on the outside of the clamping disc (212).

4. A machining center for the production of explosion-proof devices according to claim 3, characterized in that: The height of the columnar protrusion (214) is not lower than the height of the annular groove (213), and the diameter of the columnar protrusion (214) does not exceed the inner hole diameter of the connection end (31) of the outer cover assembly (3).

5. A machining center for the production of flameproof devices according to claim 4, characterized in that: The modular profiling fixture (22) includes an annular beam frame (221), the bottom of the annular beam frame (221) is connected to the workbench (11) through a bracket, three profiling jaws (222) are equiangularly arranged inside the annular beam frame (221), and second cylinders (223) are provided on the outside of the three profiling jaws (222), and guide rails (224) are provided on both sides of the second cylinders (223).

6. A machining center for the production of flameproof devices according to claim 5, characterized in that: The second cylinder (223) is installed on the outside of the annular beam frame (221), the output end of the second cylinder (223) penetrates through the annular beam frame (221) and is threadedly connected to the profiling jaw (222), one end of the guide rail (224) is fixedly connected to the profiling jaw (222), and a limiting plate (225) is fixedly provided at the other end of the guide rail (224) after passing through the other end annular beam frame (221).

7. A machining center for the production of flameproof devices according to claim 6, characterized in that: The profiling jaw (222) is composed of a base skeleton (2221), an arc transition plate (2222), and a contact layer (2223). The base skeleton (2221) is made of stainless steel material, the arc transition plate (2222) is made of gradient copper-tungsten alloy material, and the contact layer (2223) is a molybdenum disulfide embedded graphene composite coating. At least one of an array of diamond-shaped protrusions and an array of wavy grooves is provided on the surface of the arc transition plate (2222).

8. A machining center for the production of flameproof devices according to claim 7, characterized in that: An arc-shaped embedding groove (2224) is provided inside the base skeleton (2221). The arc transition plate (2222) is embedded inside the arc-shaped embedding groove (2224) and fixed by screws. The molybdenum disulfide embedded graphene composite coating is sprayed on the surface of the arc transition plate (2222). The inner sides of the base skeleton (2221) and the arc transition plate (2222) have the same curvature as the inclined end transition surface (32) in the middle section of the outer cover assembly (3) to achieve "surface-to-surface" precise fitting.

9. A machining center for the production of flameproof devices according to claim 8, characterized in that: The pressure sensing fixture (23) includes a connecting rod (231). One end of the connecting rod (231) is fixed to the annular beam frame (221) by screws. A vertical threaded cylinder (232) is fixedly provided at the other end of the connecting rod (231). A profiling fitting (233) is provided at the bottom of the threaded cylinder (232). The bottom of the profiling fitting (233) has the same curvature as the inclined end transition surface (32) at the end of the outer cover assembly (3). The side surface of the profiling fitting (233) is fitted to the outer surface of the ring-shaped connecting portion (33) at the end of the outer cover assembly (3).

10. A machining center for the production of flameproof devices according to claim 9, characterized in that: A pressure sensor (234) is installed inside the side surface of the profiling fitting (233) and is electrically connected to the main control of the processing machine table (12). An adjusting bolt (235) is provided at the top of the profiling fitting (233) and is connected by a rotating shaft. The adjusting bolt (235) passes through the threaded cylinder (232) and is connected by thread engagement.

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