An automatic label changing rotary labeling machine with tiltable head

Abstract

This invention discloses an automatic rotary labeling machine with a tiltable label head, comprising a base, a worktable mounted on the top of the base, and a main rotating shaft movably passing through the center of the top of the worktable. A machine head is mounted on the upper part of the main rotating shaft. Two rotary labeling mechanisms are symmetrically mounted on one side of the bottom of the base, and two distance adjustment mechanisms are mounted on the top of the two rotary labeling mechanisms. This invention, through the installation of the rotary labeling mechanisms, utilizes the extension and retraction of a telescopic rod to drive the rotation of the label head body, achieving automatic gear switching without stopping during high-speed labeling, thus improving the production efficiency of the equipment. The automatic rotation mechanism enables rapid rotation of the bottle body on the turntable, facilitating high-speed labeling. Simultaneously, the tension wheel adjusts the tension of the belt body, preventing belt slippage. The distance adjustment mechanisms allow for adjustment of the distance between the label head body and the bottle body, enhancing the practicality of the equipment.

Description

Technical Field

[0001] This invention relates to the field of labeling machine technology, specifically to an automatic rotary labeling machine with an tiltable label head. Background Technology

[0002] A labeling machine is a device that affixes rolls of self-adhesive labels to PCBs, products, or prescribed packaging. Labeling machines are an indispensable component of modern packaging.

[0003] Existing rotary labeling machines typically employ a dual-head automatic label switching system for automatic label changing. The label heads are fixed to the frame. When one label head is almost finished with its label, it switches to the other head to dispense the new label. The old label head is then fitted with a new label and attached to the end of the old label. After replacing the label, the belt runs at a low speed around the peeling plate to prevent the label from breaking at the interface during high-speed operation. Because the label heads are fixed, this process requires the machine to be stopped, reducing production efficiency. Furthermore, existing labeling machines cannot adjust the distance between the label head and the bottle body according to the bottle's diameter, reducing the equipment's practicality. Additionally, when the labeling machine's tray is fully loaded, the drive belt may slip due to excessive load, reducing transmission stability and hindering rapid automatic labeling. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic rotary labeling machine with a tiltable label head to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic rotary labeling machine with tiltable label heads, comprising a base, a worktable mounted on the top of the base, a main rotating shaft movably passing through the center of the top of the worktable, a machine head mounted on the upper part of the main rotating shaft, two rotary labeling mechanisms symmetrically mounted on one side of the bottom of the base, two distance adjustment mechanisms mounted on the top of the two rotary labeling mechanisms, two label head bodies mounted on the top of the two distance adjustment mechanisms, an automatic rotating mechanism mounted on one side inside the base, a turntable sleeved and fixed on the upper part of the main rotating shaft, and several cup holders mounted on the top edge of the turntable.

[0006] Preferably, the rotating label-changing mechanism includes a fixed plate, a first fixed block, a first fixed pin, a first rotating head, a telescopic rod, a rotating plate, a fixed seat, a mounting block, a second fixed block, a second fixed pin, a second rotating head, a fixed groove, and a third fixed pin. Two fixed plates are symmetrically installed on one side of the bottom of the base, and two first fixed blocks are installed on one side of the top of the two fixed plates. Two first fixed pins are installed at the center of one side of the two first fixed blocks, and two first rotating heads are sleeved around the two first fixed pins. Two telescopic rods are installed on the top of the two first rotating heads, and two fixed seats are installed on the top of the two telescopic rods. Two rotating plates are rotatably connected to the top of the two fixed seats.

[0007] Preferably, two fixing grooves are formed on one side of the bottom of the two rotating plates, and two third fixing pins are installed in the lower part of the two fixing grooves. Two fixing seats are rotatably connected to the outer circumference of the center of the two third fixing pins, and the bottom of the two fixing seats is fixedly connected to the top end face of the two telescopic rods. Two second rotating heads are installed on the other side of the bottom of the two rotating plates, and a second fixing pin is movably passed through the center of one side of the two second rotating heads. The two second fixing pins are rotatably connected to the two second rotating heads, and two second fixing blocks are installed on one side of the two second fixing pins. Two mounting blocks are installed at the bottom of the two second fixing blocks, and the two mounting blocks are symmetrically installed on one side of the top of the workbench.

[0008] Preferably, two distance adjustment mechanisms are installed on the top of the two rotating label changing mechanisms. The distance adjustment mechanism includes a slide groove, a pad, a slider, a threaded block, a locking screw, and a slide rail. Two slide rails are installed at the top center of the two rotating plates, and two slide grooves are symmetrically opened on both sides of the two slide rails. Two sliders are slidably connected to the top of the two slide rails, and two pads are installed on the top of the two sliders. Two label head bodies are installed on the top of the two pads.

[0009] Preferably, four threaded blocks are symmetrically installed at the four corners of the top of the two sliders, and eight locking screws are installed at the center of the top of the eight threaded blocks by threads.

[0010] Preferably, the automatic rotating mechanism includes a friction wheel, a label-rubbing belt, a first driven bottle-rubbing wheel, a first fixed shaft, a second driven bottle-rubbing wheel, a second fixed shaft, a mounting bearing, a transmission shaft, a driving bottle-rubbing wheel, a tensioning wheel, a driving pulley, a servo motor, a limit hole, a tensioning screw, a fixing nut, a mounting plate, a driven pulley, and a belt body. A mounting plate is installed on one side of the base, and a servo motor is installed on the top side of the mounting plate. The output end of the servo motor is fixedly connected to the driving pulley, and the outer circumference center of the driving pulley is fitted with the belt body. The inner circumference of the other side of the belt body is fitted with... A driven pulley is provided, and a drive shaft is installed at the top center of the driven pulley. A mounting bearing is sleeved at the center of the drive shaft and is rotatably connected to the drive shaft. The top of the mounting bearing is fixedly inserted through one corner of the top of the worktable. An active bottle-rubbing wheel is installed at the top of the drive shaft. A label-rubbing strip is attached to the outer circumference of the active bottle-rubbing wheel, and a first driven bottle-rubbing wheel and a second driven bottle-rubbing wheel are attached to the two sides of the inner circumference of the label-rubbing strip, respectively. The bottoms of the first driven bottle-rubbing wheel and the second driven bottle-rubbing wheel are rotatably connected to a first fixed shaft and a second fixed shaft, and the first fixed shaft and the second fixed shaft are fixedly installed on the top of the worktable.

[0011] Preferably, the outer circumference of the label-rubbing belt is fitted with the outer circumference of the friction wheel. A limit hole is opened on one side of the top of the mounting plate, and a tensioning screw is slidably connected inside the limit hole. Two fixing nuts are symmetrically installed in the lower part of the tensioning screw, and the opposite sides of the two fixing nuts are fitted with the top and bottom sides of the mounting plate, respectively. A tensioning wheel is rotatably connected to the top of the tensioning screw, and the outer circumference of the tensioning wheel is fitted with one side of the outer circumference of the belt body.

[0012] Preferably, a door is installed on one side of the base, and a handle is fixedly connected to the center of one side of the door. Anchor bolts are installed at the four corners of the bottom of the base. Four frames are symmetrically installed at the four corners of the top of the workbench, and a top plate is installed on the top of the four frames.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This invention, through the installation of a rotary label-changing mechanism, utilizes the extension and retraction of a telescopic rod to drive the rotation of the label head body, thereby achieving automatic label switching without stopping the machine during high-speed labeling. Compared with existing technologies, this invention enables high-speed labeling and label changing without stopping the machine, thus improving the production efficiency of the equipment.

[0015] 2. This invention, through the installation of an automatic rotating mechanism, utilizes the rotation of the label-rubbing belt to drive the rotation of the friction wheel, thereby achieving rapid rotation of the bottle body on the turntable, facilitating high-speed labeling. At the same time, the setting of the tension wheel helps to adjust the tension of the belt body, avoiding belt slippage and improving the stability of the transmission.

[0016] 3. By installing a distance adjustment mechanism, this invention enables the adjustment of the distance between the label head and the bottle body, making it convenient to adjust the distance between them according to the actual diameter and size of the bottle body, thus improving the practicality of the equipment. Attached Figure Description

[0017] Figure 1 This is a top perspective view of the overall structure of the present invention;

[0018] Figure 2 This is a front view of the overall structure of the present invention;

[0019] Figure 3 For the present invention Figure 2 Enlarged view of region A in the middle;

[0020] Figure 4 This is a front sectional view of the overall structure of the present invention;

[0021] Figure 5 For the present invention Figure 4 Enlarged view of region B in the middle;

[0022] Figure 6 For the present invention Figure 4 Enlarged diagram of region C in the middle;

[0023] Figure 7 This is a top perspective view of the overall structure of the present invention;

[0024] Figure 8 This is a side view of the overall structure of the present invention;

[0025] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of region D in the middle;

[0026] In the diagram: 1. Base; 2. Rotating label changing mechanism; 3. Distance adjustment mechanism; 4. Label head body; 5. Frame; 6. Top plate; 7. Machine head; 8. Main shaft; 9. Automatic rotating mechanism; 10. Turntable; 11. Workbench; 12. Anchor bolt; 13. Box door; 14. Handle; 201. Fixing plate; 202. First fixing block; 203. First fixing pin; 204. First rotating head; 205. Telescopic rod; 206. Rotating plate; 207. Fixing seat; 208. Mounting block; 209. Second fixing block; 210. Second fixing pin; 211. Second rotating head; 212. Fixing groove; 213. Third fixing... Pin; 301, slide groove; 302, pad block; 303, slider; 304, threaded block; 305, locking screw; 306, slide rail; 901, friction wheel; 902, label rubbing belt; 903, first driven bottle rubbing wheel; 904, first fixed shaft; 905, second driven bottle rubbing wheel; 906, second fixed shaft; 907, mounting bearing; 908, transmission shaft; 909, driving bottle rubbing wheel; 910, tensioning wheel; 911, driving belt pulley; 912, servo motor; 913, limit hole; 914, tensioning screw; 915, fixing nut; 916, mounting plate; 917, driven belt pulley; 918, belt body. Detailed Implementation

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

[0028] Please see Figure 1-9An embodiment of the present invention provides an automatic rotary labeling machine with tiltable label heads, comprising a base 1, a door 13 installed on one side of the base 1, and a handle 14 fixedly connected to the center of one side of the door 13; anchor bolts 12 installed at the four corners of the bottom of the base 1; four frames 5 symmetrically installed at the four corners of the top of the worktable 11, and a top plate 6 installed on the top of the four frames 5; the worktable 11 is installed on the top of the base 1, and a main rotating shaft 8 is movably inserted through the center of the top of the worktable 11; a machine head 7 is installed in the upper part of the main rotating shaft 8; and two rotary labeling mechanisms 2 symmetrically installed on one side of the bottom of the base 1. Each rotary labeling mechanism 2 includes a fixed plate 201, a first fixed block 202, a first fixed pin 203, a first rotating head 204, and a telescopic rod 205. The base 1 consists of a rotating plate 206, a fixed base 207, a mounting block 208, a second fixed block 209, a second fixed pin 210, a second rotating head 211, a fixed groove 212, and a third fixed pin 213. Two fixed plates 201 are symmetrically installed on one side of the bottom of the base 1. Two first fixed blocks 202 are installed on one side of the top of the two fixed plates 201. Two first fixed pins 203 are installed at the center of one side of each of the two first fixed blocks 202. Two first rotating heads 204 are sleeved around the periphery of each of the two first fixed pins 203. Two telescopic rods 205 are installed on the top of each of the two first rotating heads 204. Two fixed bases 207 are installed on the top of each of the two telescopic rods 205. Two rotating plates 206 are rotatably connected to the top of each of the two fixed bases 207. The bottom of each of the two rotating plates 206... Two fixing slots 212 are provided on one side of the part, and two third fixing pins 213 are installed in the lower part of the two fixing slots 212. Two fixing seats 207 are rotatably connected to the outer circumference of the center of the two third fixing pins 213, and the bottom of the two fixing seats 207 is fixedly connected to the top end face of the two telescopic rods 205. Two second rotating heads 211 are installed on the other side of the bottom of the two rotating plates 206, and a second fixing pin 210 is movably passed through the center of one side of the two second rotating heads 211. The two second fixing pins 210 are rotatably connected to the two second rotating heads 211, and two second fixing blocks 209 are installed on one side of the two second fixing pins 210. Two mounting blocks 208 are installed at the bottom of the two second fixing blocks 209, and the two mounting blocks 208 are symmetrically installed on the working part. One side of the top of the tabletop 11 facilitates angle adjustment of the label head body 4, enabling automatic label switching without stopping the machine during high-speed labeling. Two distance adjustment mechanisms 3 are mounted on the top of the two rotating label changing mechanisms 2. Each distance adjustment mechanism 3 includes a groove 301, a pad 302, a slider 303, a threaded block 304, a locking screw 305, and a slide rail 306. Two slide rails 306 are mounted at the center of the top of the two rotating plates 206, and two grooves 301 are symmetrically formed on both sides of each slide rail 306. Two sliders 303 are slidably connected to the top of the two slide rails 306, and two pads 302 are mounted on the top of each slider 303. Two label head bodies 4 are mounted on the top of each pad 302.Four threaded blocks 304 are symmetrically installed at the four corners of the top of the two sliders 303, and eight locking screws 305 are threadedly installed at the center of the top of the eight threaded blocks 304, which is beneficial for adjusting the distance between the label head body 4 and the bottle body. Two label head bodies 4 are installed on the top of the two distance adjustment mechanisms 3. An automatic rotation mechanism 9 is installed on one side inside the base 1. The automatic rotation mechanism 9 includes a friction wheel 901, a label rubbing belt 902, a first driven bottle rubbing wheel 903, a first fixed shaft 904, a second driven bottle rubbing wheel 905, a second fixed shaft 906, a mounting bearing 907, a transmission shaft 908, a driving bottle rubbing wheel 909, a tensioning wheel 910, and a driving belt pulley 900. 11. Servo motor 912, limit hole 913, tension screw 914, fixing nut 915, mounting plate 916, driven pulley 917, and belt body 918. A mounting plate 916 is installed on one side of the base 1, and a servo motor 912 is installed on one side of the top of the mounting plate 916. A drive pulley 911 is fixedly connected to the output end of the servo motor 912, and the belt body 918 is fitted to the center of the outer circumference of the drive pulley 911. The driven pulley 917 is fitted to the inner circumference of the other side of the belt body 918, and a drive shaft 908 is installed at the center of the top of the driven pulley 917. A mounting bearing 907 is sleeved on the center of the drive shaft 908. The bearing 907 is rotatably connected to the drive shaft 908. The top of the bearing 907 is fixedly positioned through one corner of the top of the worktable 11. A drive bottle-rubbing wheel 909 is mounted on the top of the drive shaft 908. A label-rubbing strip 902 is attached to the outer circumference of the drive bottle-rubbing wheel 909. A first driven bottle-rubbing wheel 903 and a second driven bottle-rubbing wheel 905 are respectively attached to the inner circumference of the label-rubbing strip 902 on both sides. A first fixed shaft 904 and a second fixed shaft 906 are rotatably connected to the bottom of the first driven bottle-rubbing wheel 903 and the second driven bottle-rubbing wheel 905. The first fixed shaft 904 and the second fixed shaft 906 are fixedly mounted on the top of the worktable 11. The outer circumference of the label-rubbing strip 902 is... The friction wheel 901 is circumferentially fitted. A limiting hole 913 is formed on one side of the top of the mounting plate 916, and a tensioning screw 914 is slidably connected inside the limiting hole 913. Two fixing nuts 915 are symmetrically installed on the lower part of the tensioning screw 914, and the opposite sides of the two fixing nuts 915 are respectively fitted to the top and bottom sides of the mounting plate 916. A tensioning wheel 910 is rotatably connected to the top of the tensioning screw 914, and the outer circumference of the tensioning wheel 910 is fitted to one side of the outer circumference of the belt body 918, which facilitates high-speed rotation of the bottle and prevents slippage. A turntable 10 is sleeved and fixed to the upper part of the main rotating shaft 8, and several cup holders are installed on the top edge of the turntable 10.

[0029] Working Principle: In use, this invention first adjusts the distance between the label head body 4 and the bottle body according to the size and diameter of the bottle to be labeled. Loosening the locking screw 305 releases the locking fixation of the rotating plate 206. At this point, the slider 303 slides along the slide rail 306, which in turn drives the pad 302 to slide along the slide rail 306, thereby causing the label head body 4 to slide along the slide rail 306. This achieves the adjustment of the distance between the label head body 4 and the bottle body, facilitating labeling of bottles with different diameters and improving equipment performance. To ensure practicality, the bottle is placed on the bottle holder at the top of the turntable 10. The servo motor 912 is then turned on, and its output begins to rotate, driving the drive pulley 911 to rotate, which in turn drives the belt body 918 to rotate, which in turn drives the driven pulley 917 to rotate. The rotation of the driven pulley 917 drives the transmission shaft 908 to rotate, which in turn drives the drive bottle-rubbing wheel 909 to rotate, subsequently driving the label-rubbing belt 902 to rotate. This, in turn, drives the friction wheel 901 to rotate. The rotation of shaft 1 drives the rotation of main shaft 8, which in turn drives turntable 10 to rotate, and then drives the bottle body on the bottle holder to rotate. When the belt body 918 slips, loosen the fixing nut 915 to loosen the fixing of the two fixing nuts 915 to the tensioning screw 914. At this time, adjust the tension of the tensioning wheel 910 to the belt body 918 along the limiting hole 913. After adjustment, tighten the fixing nut 915 to fix it. After completion, the belt body 918 is tensioned and fixed, avoiding slippage of the belt body 918 during use. Now, the telescopic rod 205 is opened, and the output end of the telescopic rod 205 begins to extend, which then drives the rotating plate 206 to rotate around the second fixed block 209. This, in turn, drives the distance adjustment mechanism 3 to rotate around the second fixed block 209, thereby driving the label head body 4 to rotate around the second fixed block 209. The two label head bodies 4 rotate and change labels under the drive of the telescopic rod 205, realizing the function of automatic label switching without stopping the machine during high-speed labeling. Compared with the existing technology, it can realize high-speed labeling and label changing without stopping the machine, which can improve the production efficiency of the equipment.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention 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 the invention 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 the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An automatic rotary labeling machine with a tiltable label head, comprising a base (1), characterized in that: The base (1) is equipped with a workbench (11) on top, and a main rotating shaft (8) is movably passed through the center of the top of the workbench (11). A machine head (7) is installed in the upper part of the main rotating shaft (8). Two rotating label changing mechanisms (2) are symmetrically installed on one side of the bottom of the base (1), and two distance adjustment mechanisms (3) are installed on the top of the two rotating label changing mechanisms (2). Two label head bodies (4) are installed on the top of the two distance adjustment mechanisms (3). An automatic rotating mechanism (9) is installed on one side inside the base (1). A turntable (10) is sleeved and fixed in the upper part of the main rotating shaft (8), and several cup holders are installed on the top edge of the turntable (10). The rotating label changing mechanism (2) includes a fixed plate (201), a first fixed block (202), a first fixed pin (203), a first rotating head (204), a telescopic rod (205), a rotating plate (206), a fixed seat (207), a mounting block (208), a second fixed block (209), a second fixed pin (210), a second rotating head (211), a fixed groove (212), and a third fixed pin (213). Two fixed plates (201) are symmetrically installed on one side of the bottom of the base (1), and two first fixed blocks (202) are installed on one side of the top of the two fixed plates (201). Two first fixed pins (203) are installed at the center of one side of the two first fixed blocks (202), and two first rotating heads (204) are sleeved around the two first fixed pins (203). Two telescopic rods (205) are installed on the top of the two first rotating heads (204), and two fixed seats (207) are installed on the top of the two telescopic rods (205). Two rotating plates (206) are rotatably connected to the top of the two fixed seats (207). Two fixing slots (212) are opened on one side of the bottom of the two rotating plates (206), and two third fixing pins (213) are installed in the lower part of the two fixing slots (212). Two fixing seats (207) are rotatably connected to the outer circumference of the center of the two third fixing pins (213), and the bottom of the two fixing seats (207) is fixedly connected to the top end face of the two telescopic rods (205). Two second rotating heads (211) are installed on the other side of the bottom of the two rotating plates (206), and a second fixing pin (210) is movably passed through the center of one side of the two second rotating heads (211). The two second fixing pins (210) are rotatably connected to the two second rotating heads (211), and two second fixing blocks (209) are installed on one side of the two second fixing pins (210). Two mounting blocks (208) are installed at the bottom of the two second fixing blocks (209), and the two mounting blocks (208) are symmetrically installed on one side of the top of the workbench (11). The distance adjustment mechanism (3) includes a slide groove (301), a pad (302), a slider (303), a threaded block (304), a locking screw (305), and a slide rail (306). Two slide rails (306) are installed at the top center of the two rotating plates (206), and two slide grooves (301) are symmetrically opened on both sides of the two slide rails (306). Two sliders (303) are slidably connected to the top of the two slide rails (306), and two pads (302) are installed on the top of the two sliders (303). Two pointer bodies (4) are installed on the top of the two pads (302). Four threaded blocks (304) are symmetrically installed at the four corners of the top of the two sliders (303), and eight locking screws (305) are installed at the top center of the eight threaded blocks (304) through threads. The automatic rotating mechanism (9) includes a friction wheel (901), a label-rubbing belt (902), a first driven bottle-rubbing wheel (903), a first fixed shaft (904), a second driven bottle-rubbing wheel (905), a second fixed shaft (906), a mounting bearing (907), a transmission shaft (908), a driving bottle-rubbing wheel (909), a tensioning wheel (910), a driving pulley (911), a servo motor (912), a limiting hole (913), a tensioning screw (914), a fixing nut (915), a mounting plate (916), a driven pulley (917), and a belt body (918). The mounting plate (916) is installed on one side inside the base (1), and the servo motor (912) is installed on the top side of the mounting plate (916). The output end of the servo motor (912) is fixedly connected to the driving pulley (911), and the belt body (918) is attached to the center of the outer circumference of the driving pulley (911). On the other side, a driven pulley (917) is fitted to the inner circumference, and a drive shaft (908) is installed at the top center of the driven pulley (917). A mounting bearing (907) is sleeved at the center of the drive shaft (908), and the mounting bearing (907) is rotatably connected to the drive shaft (908). The top of the mounting bearing (907) is fixedly inserted through one corner of the top of the worktable (11), and an active bottle-rubbing wheel (909) is installed at the top of the drive shaft (908). 909) A label rubbing strip (902) is attached to the outer circumference, and a first driven bottle rubbing wheel (903) and a second driven bottle rubbing wheel (905) are attached to both sides of the inner circumference of the label rubbing strip (902). The bottom of the first driven bottle rubbing wheel (903) and the second driven bottle rubbing wheel (905) are rotatably connected to a first fixed shaft (904) and a second fixed shaft (906), and the first fixed shaft (904) and the second fixed shaft (906) are fixedly installed on the top of the workbench (11). The outer circumference of the label rubbing belt (902) is in contact with the outer circumference of the friction wheel (901). A limiting hole (913) is opened on one side of the top of the mounting plate (916), and a tensioning screw (914) is slidably connected inside the limiting hole (913). Two fixing nuts (915) are symmetrically installed in the lower part of the tensioning screw (914), and the opposite sides of the two fixing nuts (915) are in contact with the top and bottom sides of the mounting plate (916), respectively. A tensioning wheel (910) is rotatably connected to the top of the tensioning screw (914), and the outer circumference of the tensioning wheel (910) is in contact with one side of the outer circumference of the belt body (918).

2. The automatic rotary labeling machine with a tiltable label head according to claim 1, characterized in that: A box door (13) is installed on one side of the base (1), and a handle (14) is fixedly connected to the center of one side of the box door (13). Anchor bolts (12) are installed at the four corners of the bottom of the base (1). Four machine frames (5) are symmetrically installed at the four corners of the top of the workbench (11), and a top plate (6) is installed on the top of the four machine frames (5).

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