A machining center

CN224764941UActive Publication Date: 2026-09-18广东巨高智能设备有限公司
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Patent Information

Application Number
CN202522054795.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-24
Publication Date
2026-09-18
Estimated Expiration
2035-09-24

AI Technical Summary

Technical Problem

[0006]本实用新型的目的在于提供一种加工中心,其能够解决现有加工中心防护门无法做到全部打开的问题

Benefits of technology

[0021] Compared with the prior art, the machining center of this utility model, through related structural design, can open a pair of movable doors to both sides for machining operations during normal processing, and can rotate the first cover plate upward to open when maintenance is required, thereby increasing the upper limit of the exposed space inside the machine tool.

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Abstract

This utility model discloses a machining center, comprising: a machine body, a second cover plate, a pair of movable doors, a support frame, a pair of locking mechanisms, and a fixing mechanism. The locking mechanisms are respectively installed on the pair of movable doors, and each locking mechanism includes: a pair of locking rods, a rotating plate, and a locking component. The pair of locking rods are both fixed to the outer wall of the second cover plate. A sliding groove is carved into the movable door, and the pair of locking rods slide within the sliding groove. The rotating plate rotates on the top wall of the sliding groove near its outer end, and a pair of arc-shaped locking heads are fixed to the bottom of the rotating plate. The fixing mechanism is installed inside the inner wall of the machine body, and includes: multiple pairs of plugs and a control component. The multiple pairs of plugs are fixed to the bottom end of the second cover plate. Multiple pairs of slots adapted to the plugs are carved into the bottom edge of the machine body, and insertion rods slide within the adjacent side walls of each pair of slots. The control component is installed within the side wall of the machine body. This utility model, through its structural design, effectively increases the upper limit of the exposed space inside the machine tool.
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Description

Technical Field

[0001] This utility model belongs to the technical field of machining centers, and specifically relates to a machining center. Background Technology

[0002] A machining center is a highly automated, multi-functional CNC machine tool. It typically consists of a control system, servo system, detection system, mechanical transmission system, and other auxiliary systems. Equipped with a tool magazine and automatic tool changer, it can perform multiple machining operations after a single workpiece clamping. It can continuously complete drilling, boring, milling, reaming, tapping, and other processes, significantly reducing the time spent on auxiliary operations such as workpiece clamping, measurement, and machine tool adjustment. It offers excellent economic benefits for machining parts with complex shapes, high precision requirements, and frequent product changes.

[0003] Currently, the protective doors for CNC machine tools are usually double-leaf swing doors. The width of the door frame of a double-leaf swing door is approximately 1 / 4 of the length of the machine tool. When the double-leaf swing door is opened to both sides, it can only expose up to 1 / 2 of the machine tool. This results in an upper limit to the exposed space inside the machine tool. This does not have a significant impact during normal processing operations. However, when the entire CNC machine tool needs to be inspected and repaired, exposing only 1 / 2 of the machine tool will directly affect the inspection and repair of the CNC machine tool.

[0004] Therefore, it is necessary to provide a machining center to address the aforementioned technical problems.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a machining center that can solve the problem that the protective doors of existing machining centers cannot be fully opened.

[0007] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0008] A machining center includes: a body, a second cover plate, a pair of movable doors, a support frame, a pair of locking mechanisms, and a fixing mechanism.

[0009] A first cover plate is rotatably mounted on the side wall of the machine body. One end of a second cover plate rotates to one end of the first cover plate, and the first and second cover plates close together at the top and side openings of the machine body. An opening is provided in the middle of the second cover plate. A pair of sliding doors slide on the second cover plate and are located at the openings of the second cover plate. The support frame is fixed to the inner wall of the machine body and supported by the bottom of the first and second cover plates.

[0010] A pair of locking mechanisms are respectively installed on a pair of sliding doors. Each locking mechanism includes a pair of locking rods, a rotating plate, and a locking assembly. The locking rods are both fixed to the outer wall of the second cover plate. A sliding groove is carved into the sliding door, and the locking rods slide within this groove. The rotating plate rotates on the top wall of the groove near its outer end. A pair of arc-shaped locking heads are fixed to the bottom of the rotating plate, and first springs are installed between the top two ends of the rotating plate and the inner wall of the sliding door. The locking assembly is installed on the sliding door and is used to lock the sliding door.

[0011] The fixing mechanism is installed inside the inner wall of the machine body and includes multiple pairs of plugs and a control component. Each pair of plugs is fixed to the bottom end of the second cover plate. Multiple pairs of slots adapted to the plugs are chiseled at the bottom edge of the machine body. Insert rods slide within the adjacent side walls of each pair of slots. The control component is installed within the side wall of the machine body and is used to move a pair of insert rods closer together or further apart.

[0012] In one embodiment of this utility model, sealing grooves are chiseled into the support frames on both sides of the machine body, and sealing strips are fixed at both edges of the first cover plate and the second cover plate, with the sealing strips inserted into the sealing grooves. When the first cover plate and the second cover plate are closed on the machine body, the sealing strips on the first cover plate and the second cover plate are respectively inserted into the sealing grooves, thereby sealing the first cover plate and the second cover plate with the side walls of the machine body.

[0013] In one embodiment of this utility model, a pair of slide rails are formed on the outer wall of the second cover plate, and sliders are fixed on the inner walls of each pair of movable doors. The sliders slide within the pair of slide rails. The movable doors slide on the second cover plate by sliding within the pair of slide rails via the sliders.

[0014] In one embodiment of this utility model, a rotating shaft is fixed to the top wall of the chute near its outer end. The rotating plate rotates on the rotating shaft, and a pair of first springs are respectively disposed on both sides of the rotating shaft. The rotating shaft is used for the rotating plate to rotate on it, and the pair of first springs respectively disposed on both sides of the rotating shaft, so that the rotating plate is kept in balance under the combined action of the pair of first springs.

[0015] In one embodiment of this utility model, a pair of plug-in blocks are fixed to the top of the rotating plate and the inner wall of the movable door. The upper and lower ends of the pair of first springs are both locked onto the plug-in blocks. By locking the upper and lower ends of the first springs onto the plug-in blocks respectively, the first springs are prevented from slipping when the rotating plate rotates.

[0016] In one embodiment of this utility model, the locking assembly includes a rotating rod, a threaded hole, and a handle. The rotating rod rotates on the sliding door, and a threaded head is fixed at one end near the locking rod. The threaded hole is drilled on the locking rod, and the internal thread of the threaded hole is adapted to the external thread of the threaded head. The handle is fixed to the end of the rotating rod located outside the sliding door. When it is necessary to lock the sliding door, the handle drives the rotating rod to rotate, and the handle is pushed towards the threaded head, thereby causing the rotating rod to drive the threaded head to rotate into the threaded hole on the locking rod, thereby locking the sliding door.

[0017] In one embodiment of this utility model, a second spring is installed between the handle and the outer wall of the sliding door, and the second spring is sleeved on the rotating rod. The second spring is used to push the handle in the opposite direction to the threaded head when the rotating rod is not turned into the threaded hole, so that the handle drives the threaded head to move into the inner wall of the slide groove through the rotating rod.

[0018] In one embodiment of this utility model, the control component includes: a rotating rod, a pair of threaded rods, and a knob. The rotating rod rotates within the machine body and is positioned between the pair of plugs. The pair of threaded rods are respectively fixed to both ends of the pair of rotating rods and are threadedly connected to the pair of plugs. The knob is fixed to the rotating rod, and a knob groove is carved into the side wall of the machine body, with one end of the knob positioned within the knob groove. In use, the knob drives the rotating rod to rotate, which in turn drives the pair of threaded rods to rotate. Because the threaded rods and plugs are threadedly connected, the rotation of the threaded rods causes the pair of plugs to move closer or further apart, thereby allowing the pair of plugs to be inserted into or removed from the pair of plugs.

[0019] In one embodiment of this utility model, a fixing head is fixed to one end of each pair of insertion rods located inside the machine body. The fixing head is used to limit the outward extension length of the insertion rods.

[0020] In one embodiment of this utility model, a pair of limiting grooves are chiseled on the insertion rod, and a pair of limiting slides adapted to the limiting grooves are fixed inside the side wall of the slot. By having the pair of limiting slides slide in the pair of limiting grooves respectively, the insertion rod is prevented from rotating.

[0021] Compared with the prior art, the machining center of this utility model, through related structural design, can open a pair of movable doors to both sides for machining operations during normal processing, and can rotate the first cover plate upward to open when maintenance is required, thereby increasing the upper limit of the exposed space inside the machine tool. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of a machining center according to one embodiment of the present invention;

[0024] Figure 2 This is a perspective view of another state of a machining center according to one embodiment of the present invention;

[0025] Figure 3 for Figure 2 The structural diagram shown at point A in the middle;

[0026] Figure 4 for Figure 2 The structural diagram shown at point B in the middle;

[0027] Figure 5 This is a schematic diagram of the structure of a sliding door in one embodiment of the present invention;

[0028] Figure 6 for Figure 5 The structural diagram shown at point C.

[0029] Explanation of key figure labels:

[0030] 1-Main body, 101-First cover plate, 102-Second cover plate, 103-Sliding door, 104-Slide rail, 105-Slider, 106-Support frame, 107-Sealing groove, 108-Sealing strip, 2-Lock mechanism, 201-Lock rod, 202-Slide groove, 203-Rotating shaft, 204-Rotating plate, 205-Arc-shaped clamp, 206-First spring, 207-Plug-in block, 208-Threaded hole, 209-Rotating rod, 210-Threaded head, 211-Handle, 212-Second spring, 3-Fixing mechanism, 301-Plug, 302-Slot, 303-Plug-in rod, 304-Fixing head, 305-Rotating rod, 306-Threaded rod, 307-Knob, 308-Knob groove, 309-Limiting groove, 310-Limiting slide bar. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0032] like Figures 1 to 6 As shown, a processing center in one embodiment of the present invention includes: a body 1, a second cover plate 102, a pair of movable doors 103, a support frame 106, a pair of locking mechanisms 2 and a fixing mechanism 3.

[0033] like Figures 1 to 6 As shown, a first cover plate 101 is rotatably mounted on the side wall of the machine body 1. One end of a second cover plate 102 is rotatably mounted on one end of the first cover plate 101. The first cover plate 101 and the second cover plate 102 cover the top and side openings of the machine body 1, and the second cover plate 102 has an opening in the middle. A pair of sliding doors 103 slide on the second cover plate 102 and are located at the openings of the second cover plate 102. A support frame 106 is fixed to the inner wall of the machine body 1 and supported by the bottom of the first cover plate 101 and the second cover plate 102.

[0034] like Figures 1 to 6 As shown, a pair of locking mechanisms 2 are respectively installed on a pair of sliding doors 103. Each locking mechanism 2 includes a pair of locking rods 201, a rotating plate 204, and a locking assembly. The locking rods 201 are both fixed to the outer wall of the second cover plate 102. A sliding groove 202 is carved into the sliding door 103, and the locking rods 201 slide within the groove 202. The rotating plate 204 rotates on the top wall of the groove 202 near its outer end. A pair of arc-shaped locking heads 205 are fixed to the bottom of the rotating plate 204. First springs 206 are installed between the top two ends of the rotating plate 204 and the inner wall of the sliding door 103. The locking assembly is installed on the sliding door 103 and is used to lock the sliding door 103.

[0035] like Figures 1 to 6 As shown, the fixing mechanism 3 is installed inside the inner wall of the body 1. The fixing mechanism 3 includes multiple pairs of plugs 301 and a control component. The multiple pairs of plugs 301 are all fixed to the bottom end of the second cover plate 102. Multiple pairs of slots 302 adapted to the plugs 301 are carved into the bottom edge of the body 1. Insert rods 303 slide within the adjacent side walls of each pair of slots 302. The control component is installed inside the side wall of the body 1 and is used to move the pair of insert rods 303 closer together or further apart.

[0036] When this device performs processing operations, the first cover plate 101 and the second cover plate 102 are placed on the machine body 1, causing multiple pairs of plugs 301 at the bottom of the second cover plate 102 to be inserted into multiple slots 302. A pair of insert rods 303 are moved to both sides via a control component and inserted into a pair of plugs 301, fixing the plugs 301 in the slots 302, thereby securing the first cover plate 101 and the second cover plate 102. When maintenance is required, the pair of insert rods 303 are pulled out of the plugs 301 via the control component, and then the first cover plate 101 and the second cover plate 102 are rotated upwards to open, revealing the entire interior of the machine tool for maintenance.

[0037] When the sliding door 103 needs to be opened, it is first unlocked by the locking assembly. Then, a certain pushing force is applied to the sliding door 103, causing it to slide to one side. As the sliding door 103 slides to one side, the locking rod 201 pushes the rotating plate 204 to rotate by pushing the arc-shaped locking head 205 on one side. This causes the locking rod 201 to move away from between the pair of arc-shaped locking heads 205. After the locking rod 201 moves away from between the pair of arc-shaped locking heads 205, the elastic force of a pair of first springs 206 pushes both ends of the rotating plate 204, causing the rotating plate 204 to return to a horizontal position. When the sliding door 103 is pushed to one side, the arc-shaped locking head 205 on one side of the rotating plate 204 touches another locking rod 201, causing the rotating plate 204 to rotate and locking the locking rod 201 between the pair of arc-shaped locking heads 205. The positions of the other pair of locking rods 201 correspond to the open and closed positions of the sliding door 103, respectively.

[0038] like Figures 1 to 6 As shown, sealing grooves 107 are carved into the support frames 106 on both sides of the body 1. Sealing strips 108 are fixed to the edges of both sides of the first cover plate 101 and the second cover plate 102, and the sealing strips 108 are inserted into the sealing grooves 107. When the first cover plate 101 and the second cover plate 102 are closed on the body 1, the sealing strips 108 on the first cover plate 101 and the second cover plate 102 are respectively inserted into the sealing grooves 107, thereby sealing the first cover plate 101 and the second cover plate 102 with the side walls of the body 1. A pair of slide rails 104 are carved into the outer wall of the second cover plate 102, and sliders 105 are fixed to the inner walls of the pair of sliding doors 103. The pair of sliders 105 slide within the pair of slide rails 104. The sliding doors 103 slide on the second cover plate 102 by sliding within the pair of slide rails 104 via the pair of sliders 105.

[0039] like Figures 1 to 6As shown, a rotating shaft 203 is fixed to the top wall of the slide 202 near its outer end. The rotating plate 204 rotates on the rotating shaft 203, and a pair of first springs 206 are respectively disposed on both sides of the rotating shaft 203. The rotating shaft 203 is used for the rotating plate 204 to rotate on it. The pair of first springs 206 on both sides of the rotating shaft 203 keep the rotating plate 204 balanced by the combined action of the pair of first springs 206. A pair of plug-in blocks 207 are fixed to the top of the rotating plate 204 and the inner wall of the sliding door 103. The upper and lower ends of the pair of first springs 206 are locked onto the plug-in blocks 207. The locking of the upper and lower ends of the first springs 206 onto the plug-in blocks 207 prevents the first springs 206 from slipping off when the rotating plate 204 rotates.

[0040] like Figures 1 to 6 As shown, the locking assembly includes a rotating rod 209, a threaded hole 208, and a handle 211. The rotating rod 209 rotates on the sliding door 103, and a threaded head 210 is fixed to one end near the locking rod 201. The threaded hole 208 is drilled into the locking rod 201, and the internal thread of the threaded hole 208 is adapted to the external screw of the threaded head 210. The handle 211 is fixed to the end of the rotating rod 209 located outside the sliding door 103. When it is necessary to lock the sliding door 103, the handle 211 drives the rotating rod 209 to rotate, and pushes the handle 211 towards the threaded head 210, thereby causing the rotating rod 209 to rotate the threaded head 210 into the threaded hole 208 on the locking rod 201, thereby locking the sliding door 103.

[0041] like Figures 1 to 6 As shown, a second spring 212 is installed between the handle 211 and the outer wall of the sliding door 103, and the second spring 212 is sleeved on the rotating rod 209. The second spring 212 is used to push the handle 211 in the opposite direction to the threaded head 210 when the rotating rod 209 is not turned into the threaded hole 208, so that the handle 211 drives the threaded head 210 to move into the inner wall of the slide groove 202 through the rotating rod 209.

[0042] like Figures 1 to 6As shown, the control assembly includes a rotating rod 305, a pair of threaded rods 306, and a knob 307. The rotating rod 305 rotates within the body 1 and is positioned between the pair of insertion rods 303. The pair of threaded rods 306 are respectively fixed to both ends of the rotating rod 305 and are threadedly connected to the pair of insertion rods 303. The knob 307 is fixed to the rotating rod 305, and a knob groove 308 is carved into the side wall of the body 1, with one end of the knob 307 located within the knob groove 308. In use, the knob 307 drives the rotating rod 305 to rotate, which in turn drives the pair of threaded rods 306 to rotate. Because the threaded rods 306 and the insertion rods 303 are threadedly connected, the rotation of the threaded rods 306 causes the pair of insertion rods 303 to move closer to or further away from each other, thereby allowing the pair of insertion rods 303 to be inserted into or removed from the pair of plugs 301.

[0043] like Figures 1 to 6 As shown, a pair of insertion rods 303 are each fixed to a fixing head 304 at one end within the body 1. The fixing head 304 is used to limit the outward extension length of the insertion rods 303. A pair of limiting grooves 309 are carved on the insertion rods 303, and a pair of limiting slides 310 adapted to the limiting grooves 309 are fixed inside the side wall of the slot 302. By sliding the pair of limiting slides 310 within the pair of limiting grooves 309 respectively, the insertion rods 303 are prevented from rotating.

[0044] Working Principle: During processing, the first cover plate 101 and the second cover plate 102 are placed on the machine body 1, causing multiple pairs of plugs 301 at the bottom of the second cover plate 102 to be inserted into multiple slots 302. A knob 307 drives a rotating rod 305 to rotate, which in turn drives a pair of threaded rods 306 to rotate. As the threaded rods 306 rotate, they move a pair of insert rods 303 outwards and insert them into the pair of plugs 301, fixing the plugs 301 in the slots 302. This secures the first cover plate 101 and the second cover plate 102. When maintenance is required, the control assembly pulls the pair of insert rods 303 out of the plugs 301, and then the first cover plate 101 and the second cover plate 102 are rotated upwards to open, revealing the entire interior of the machine tool for maintenance.

[0045] When the sliding door 103 needs to be opened, the handle 211 first drives the rotating rod 209 to rotate, causing the rotating rod 209 to drive the threaded head 210 out of the threaded hole 208. Then, the elastic force of the second spring 212 pushes the handle 211 in the opposite direction to the threaded head 210, so that the handle 211, through the rotating rod 209, drives the threaded head 210 to move into the inner wall of the slide groove 202. Then, a certain pushing force is applied to the sliding door 103 to slide to one side. When the sliding door 103 slides to one side, the locking rod 201 pushes the rotating plate 204 to rotate by pushing the arc-shaped locking head 205 on one side, so that the locking rod 201 moves away from the pair of arc-shaped locking heads 205. After the locking rod 201 moves away from the pair of arc-shaped locking heads 205, the elastic force of the pair of first springs 206 pushes both ends of the rotating plate 204, so that the rotating plate 204 returns to the horizontal position.

[0046] When the sliding door 103 is pushed to one side, the arc-shaped locking head 205 on one side of the rotating plate 204 contacts another locking rod 201, causing the rotating plate 204 to rotate and the locking rod 201 to lock between the pair of arc-shaped locking heads 205. This component locks the sliding door 103 in place. When it is necessary to lock the sliding door 103, it can be locked using the locking assembly. During normal processing, it is not necessary to lock the sliding door 103 using the locking assembly; simply locking the sliding door 103 between the pair of arc-shaped locking heads 205 with the locking rod 201 is sufficient.

[0047] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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, characterized in that, include: The machine body, wherein a first cover plate is rotatably mounted on the side wall of the machine body. The second cover plate has one end that rotates to one end of the first cover plate, and the second cover plate has an opening in the middle. A pair of sliding doors, both sliding on the second cover plate, and located at the opening of the second cover plate; The support frame is fixed to the inner wall of the machine body; A pair of locking mechanisms are respectively installed on a pair of sliding doors. Each locking mechanism includes: a pair of locking rods, a rotating plate, and a locking assembly. The locking rods are both fixed to the outer wall of a second cover plate. A sliding groove is carved into each sliding door, and the locking rods slide within the groove. The rotating plate rotates on the top wall of the groove near its outer end. A pair of arc-shaped locking heads are fixed to the bottom of the rotating plate. First springs are installed between the top two ends of the rotating plate and the inner wall of the sliding door. The locking assembly is installed on the sliding door. A fixing mechanism is installed inside the inner wall of the machine body. The fixing mechanism includes: multiple pairs of plugs and a control component. The multiple pairs of plugs are fixed to the bottom end of the second cover plate. Multiple pairs of slots adapted to the plugs are chiseled at the bottom edge of the machine body. Insert rods slide inside the adjacent side walls of a pair of slots. The control component is installed inside the side wall of the machine body.

2. A machining center according to claim 1, characterized in that, Sealing grooves are cut into the support frames on both sides of the machine body. Sealing strips are fixed at the edges of both sides of the first cover plate and the second cover plate, and the sealing strips are inserted into the sealing grooves.

3. A machining center according to claim 1, characterized in that, A pair of slide rails are carved into the outer wall of the second cover plate, and a slider is fixed on the inner wall of each of the two sliding doors. The two sliders slide in the pair of slide rails respectively.

4. A machining center according to claim 1, characterized in that A rotating shaft is fixed to the top wall of the chute near its outer end. The rotating plate rotates on the rotating shaft, and a pair of the first springs are respectively disposed on both sides of the rotating shaft.

5. A machining center according to claim 4, characterized in that, A pair of plug-in blocks are fixed to the top of the rotating plate and the inner wall of the sliding door, and the upper and lower ends of the pair of first springs are both locked onto the plug-in blocks.

6. A machining center according to claim 5, characterized in that, The locking component includes: A rotating rod rotates on the sliding door, and a threaded head is fixed at one end near the locking rod; A threaded hole is drilled into the locking rod, and the internal thread of the threaded hole is compatible with the external thread of the threaded head; and The handle is fixed to one end of the rotating rod located outside the sliding door.

7. A machining center according to claim 6, characterized in that, A second spring is installed between the handle and the outer wall of the sliding door, and the second spring is sleeved on the rotating rod.

8. A machining center according to claim 1, characterized in that The control component includes: A rotating rod rotates within the machine body and is positioned between a pair of insert rods; A pair of threaded rods, each fixed to one end of a pair of rotating rods, and each threadedly connected to a pair of insert rods; and A knob is fixed to a rotating rod, and a knob groove is cut into the side wall of the machine body, with one end of the knob located in the knob groove.

9. A machining center according to claim 1, characterized in that Each of the two insertion rods has a fixing head fixed at one end inside the machine body.

10. A machining center according to claim 1, characterized in that, A pair of limiting grooves are chiseled on the insertion rod, and a pair of limiting slides that are adapted to the limiting grooves are fixed inside the side wall of the slot.