Automatic curved-surface special-shaped titanium alloy curtain wall machining equipment

Abstract

The invention discloses automatic curved-surface special-shaped titanium alloy curtain wall machining equipment, and relates to the technical field of metal curtain wall cutting, the automatic curved-surface special-shaped titanium alloy curtain wall machining equipment comprises a supporting assembly, the supporting assembly comprises four second supports, and a workbench is installed at the upper ends of the four second supports; the fixed cutting assembly comprises a first mounting plate and a second mounting plate which are mounted on the workbench, and a first bearing is mounted at the end, close to the first mounting plate, of the second mounting plate; according to the curtain wall machining device, a curtain wall can be fixed firstly through the arranged fixing and cutting assembly when being machined, then the curtain wall is cut, the connection speed is extremely high, and a large amount of machining time is saved; according to the curtain wall cutting device, by arranging the cooling assembly, a cutting point can be continuously cooled when a curtain wall is cut, the burr phenomenon is prevented, and a water source can be collected for cyclic utilization.

Description

Technical Field

[0001] The invention relates to the technical field of metal curtain wall cutting, in particular to automated curved surface special-shaped titanium alloy curtain wall processing equipment. Background Art

[0002] Metal curtain wall is a new type of building curtain wall used for decoration. It is a curtain wall form that replaces the glass in the glass curtain wall with metal sheets. However, due to the different surface materials, there are great differences between the two, and they should be considered separately during the design and construction process. Due to the excellent processing performance, diverse colors and good safety of metal sheets, it can fully adapt to the design of various complex shapes, can arbitrarily add concave and convex lines, and can process various types of curved lines, giving architects huge room for development. It is very popular among architects and has achieved rapid development.

[0003] Publication number CN 216682374 U discloses a metal curtain wall sandwich panel cutting device, comprising a sliding support seat, a cutting moving part, a support base, a workpiece support column, a horizontal angle adjustment part, a rotation adjustment support part, a workpiece clamping part and a cutting assembly, wherein the support base comprises a support plate, support legs are arranged at the four corners of the lower surface of the support plate, L-shaped support foot plates are arranged on the left and right sides of the lower end of the support plate, workpiece support columns are evenly arranged on the upper surface of the support plate, each L-shaped support foot plate is provided with a workpiece clamping part, and each L-shaped support foot plate is provided with an upper and lower driving part, a rotation adjustment support part is arranged between the two upper and lower driving parts, a sliding support seat is arranged inside the rotation adjustment support part, and a cutting moving part for adjusting the sliding support seat is arranged on the rotation adjustment support part, the metal curtain wall sandwich panel cutting device has a simple structure, can accurately adjust the cutting angle, makes cutting faster, and provides convenience for people.

[0004] Although the above device can make cutting faster and more diverse, it requires the material to be placed on the device before cutting, which is time-consuming and laborious to move, and there are safety risks such as falling and injuring people. At the same time, the material needs to be fixed before cutting, which is very cumbersome.

[0005] Therefore, it is necessary to design a new technical solution. Summary of the invention

[0006] The purpose of the present invention is to provide an automated curved special-shaped titanium alloy curtain wall processing equipment to solve the problem that although the current device can make cutting faster and more diversified, it is necessary to place the material on the device before cutting, which is time-consuming and labor-intensive to move, and there are safety risks such as falling and injuring people. At the same time, the material needs to be fixed before cutting, which is a cumbersome technical problem.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: an automated curved special-shaped titanium alloy curtain wall processing equipment, a support assembly, the support assembly comprising four second brackets, and a workbench is installed on the upper end of the four second brackets;

[0008] A fixed cutting assembly, the fixed cutting assembly includes a first mounting plate and a second mounting plate mounted on the workbench, the second mounting plate having an end close to the first mounting plate being mounted with a first bearing, the first bearing having an end away from the second mounting plate being mounted with a first transmission shaft, the first transmission shaft having an end away from the first bearing being connected to the first mounting plate, two disc springs being symmetrically mounted on the first transmission shaft, a pressure rod being mounted at one end of any disc spring, a mounting cylinder being mounted on the first transmission shaft, the first mounting bracket being mounted at an end away from the working plate, the first mounting bracket being provided with a first sliding groove, the first mounting bracket being provided with a second sliding groove, the first mounting bracket being provided with a connecting groove, a sliding block being mounted in the connecting groove, the sliding block being provided with a connecting hole, a rack being mounted in the second sliding groove, the second mounting bracket being mounted at an end away from the workbench, the second mounting bracket being away from A third motor is installed at one end of the first mounting frame, a third transmission shaft is installed at one end of the inner side wall of the second mounting frame close to the third motor, a third bearing is installed at one end of the second mounting frame away from the third motor, an end of the third bearing close to the third motor is connected to an end of the third transmission shaft away from the third motor, an end of the third motor close to the third bearing is connected to an end of the third transmission shaft away from the third bearing, a gear is installed on the third transmission shaft, and the gear and the rack are kneaded, the second motor is installed at one end of the sliding block away from the second mounting frame, the second transmission shaft is installed at one end of the second motor close to the second mounting frame, the second transmission shaft passes through the connecting hole, the second bearing is installed at one end of the second transmission shaft away from the second motor, the end of the second bearing away from the second motor is connected to the back of the rack, and a cutting blade is installed on the second transmission shaft, and the cutting blade passes through the first sliding groove;

[0009] A cooling assembly comprises a support plate installed on one end of a workbench close to a first mounting plate.

[0010] As a preferred embodiment of the present invention, a first motor is installed at one end of the first mounting plate away from the first transmission shaft, and an end of the first motor close to the first mounting plate is connected to an end of the first transmission shaft on the second mounting plate.

[0011] As a preferred embodiment of the present invention, a first transmission shaft is installed through the installation tube.

[0012] As a preferred embodiment of the present invention, a water tank is installed on the upper end of the support plate, a first hose is installed on the end of the water tank close to the workbench, a mounting rod is installed on the end of the first hose away from the water tank, a nozzle is installed on the end of the mounting rod away from the first hose, a second hose is installed on the end of the water tank away from the first hose, a water pump is installed on the end of the second hose away from the water tank, a third hose is installed on the end of the water pump away from the second hose, and the water pump is fixedly connected to the end of the support plate away from the workbench.

[0013] As a preferred embodiment of the present invention, four first brackets are installed at one end of the workbench away from the first mounting frame, a collection box is installed at one end of the first bracket away from the workbench, and a third hose is connected through one end of the collection box close to the support plate.

[0014] As a preferred embodiment of the present invention, a plurality of cutting grooves are formed at one end of the workbench close to the first mounting frame, and a plurality of drainage grooves are formed at one end of the workbench away from the first mounting frame, and the lower end of any drainage groove is located at the upper end of the collection box.

[0015] As a preferred embodiment of the present invention, a base plate is installed at one end of the workbench, two inclined rods are installed at the end of the base plate away from the first mounting frame, the other end of any one of the inclined rods is connected to the corresponding second bracket, two groups of fixed blocks are installed at the upper end of the base plate, a rotating shaft is connected between any group of fixed blocks, and rear conveyor belts are installed on the two rotating shafts.

[0016] As a preferred embodiment of the present invention, a plurality of installation grooves are provided on the conveyor belt, and a rear electromagnet is installed in any installation groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention can fix the curtain wall in advance by setting up the fixed cutting assembly when processing the curtain wall, and then cut it immediately afterwards, with an extremely fast connection speed, thus saving a lot of processing time.

[0019] The present invention can continuously keep the cooling effect on the cutting point when cutting the curtain wall by means of the cooling assembly, thereby preventing the occurrence of burrs, and can also collect water for recycling.

[0020] The present invention can transport the curtain wall to the workbench through the arranged conveyor belt, thereby increasing safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 It is a front view of the present invention;

[0023] Figure 2 It is a structural diagram of the first transmission shaft of the present invention;

[0024] Figure 3 It is a structural diagram of the cutting piece of the present invention;

[0025] Figure 4 It is a front view of the first mounting frame structure of the present invention;

[0026] Figure 5 It is a rear view of the first mounting frame structure of the present invention;

[0027] Figure 6 It is a structural diagram of the cooling assembly of the present invention;

[0028] Figure 7 It is a structural diagram of the support assembly of the present invention;

[0029] Figure 8 It is a structural diagram of the conveyor belt of the present invention.

[0030] In the figure: 100, fixed cutting assembly; 110, first mounting plate; 111, second mounting plate; 112, first bearing; 113, first transmission shaft; 114, first motor; 115, coil spring; 116, pressure rod; 120, second motor; 121, second transmission shaft; 122, second bearing; 123, cutting blade; 130, mounting cylinder; 131, first mounting frame; 132, first sliding groove; 133, sliding block; 1311, connecting hole; 134, second sliding groove; 140, rack; 141, second mounting frame; 142, third motor; 143, first Three transmission shafts; 144, gears; 145, third bearing; 200, cooling assembly; 210, first bracket; 220, collecting box; 230, support plate; 240, water tank; 250, first hose; 260, mounting rod; 270, nozzle; 280, water pump; 281, second hose; 282, third hose; 300, support assembly; 310, workbench; 320, second bracket; 330, cutting groove; 340, leakage groove; 410, bottom plate; 420, inclined rod; 430, fixed block; 440, rotating shaft; 450, conveyor belt; 460, electromagnet. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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 therefore cannot be understood as a limitation on the present invention.

[0033] An automated curved special-shaped titanium alloy curtain wall processing equipment, see Figures 1 to 8, the content of claims 1 to 8, the support assembly 300, the support assembly 300 includes four second brackets 320, the upper ends of the four second brackets 320 are equipped with a workbench 310, the end of the workbench 310 close to the first mounting frame 131 is provided with a plurality of cutting grooves 330, the end of the workbench 310 away from the first mounting frame 131 is provided with a plurality of drainage grooves 340, the lower end of any one of the drainage grooves 340 is located at the upper end of the collection box 220, the fixed cutting assembly 100, the fixed cutting assembly 100 includes a first mounting plate 110 and a second mounting plate 111 mounted on the workbench 310, the end of the second mounting plate 111 close to the first mounting plate 110 is equipped with a first bearing 112, the first bearing 1 A first transmission shaft 113 is installed at one end of 12 away from the second mounting plate 111, and one end of the first transmission shaft 113 away from the first bearing 112 is connected to the first mounting plate 110. Two coil springs 115 are symmetrically installed on the first transmission shaft 113, and a pressure rod 116 is installed at one end of any coil spring 115. A mounting cylinder 130 is installed on the first transmission shaft 113, and a first mounting frame 131 is installed at one end of the mounting cylinder 130 away from the working plate. A first sliding groove 132 is provided on the first mounting frame 131, and a second sliding groove 134 is provided on the first mounting frame 131. A connecting groove is provided on the first mounting frame 131, and a sliding block 133 is installed in the connecting groove. There is a connecting hole 1311, a rack 140 is installed in the second sliding groove 134, a second mounting frame 141 is installed at one end of the first mounting frame 131 away from the workbench 310, a third motor 142 is installed at one end of the second mounting frame 141 away from the first mounting frame 131, a third transmission shaft 143 is installed at one end of the inner side wall of the second mounting frame 141 close to the third motor 142, a third bearing 145 is installed at one end of the second mounting frame 141 away from the third motor 142, an end of the third bearing 145 close to the third motor 142 is connected to an end of the third transmission shaft 143 away from the third motor 142, and an end of the third motor 142 close to the third bearing 145 is connected to the third transmission shaft 143 away from the third motor 142. One end of the bearing 145 is connected, a gear 144 is installed on the third transmission shaft 143, and the gear 144 and the rack 140 are kneaded, the second motor 120 is installed on the end of the sliding block 133 away from the second mounting frame 141, and the second motor 120 is installed on the end close to the second mounting frame 141. The second transmission shaft 121 passes through the connecting hole 1311, and the second bearing 122 is installed on the end of the second transmission shaft 121 away from the second motor 120. The end of the second bearing 122 away from the second motor 120 is connected to the back of the rack 140, and a cutting blade 123 is installed on the second transmission shaft 121, and the cutting blade 123 passes through the first sliding groove 132;A first motor 114 is installed at one end of the first mounting plate 110 away from the first transmission shaft 113, and one end of the first motor 114 close to the first mounting plate 110 is connected to one end of the first transmission shaft 113 and the second mounting plate 111, and the first transmission shaft 113 is installed through the mounting tube 130. When working, the first motor 114 is directly started, and the first motor 114 drives the first transmission shaft 113 to rotate around the first bearing 112. When the first transmission shaft 113 rotates, it will drive the mounting tube 130 to rotate, and when the mounting tube rotates, it drives the disc springs 115 on both sides to move synchronously, and when the disc spring 115 rotates, it drives the corresponding pressure rod 116 to move downward and act on the curtain wall to fix it, and then the first transmission shaft 113 continues to move, driving the first mounting frame 131 to move downward. When moving, the second motor 120 is started, and the second motor 120 drives the second transmission shaft 121 to rotate around the second bearing 122. When the second transmission shaft 121 rotates, it drives the cutting blade 123 to rotate and cut the curtain wall. Then the third motor 142 is started, and the third motor 142 drives the third transmission shaft 143 to rotate around the third bearing 145. When the third transmission shaft 143 rotates, it drives the gear 144 to rotate. When the gear 144 rotates, it drives the rack 140 meshing with it to slide to the other end in the second sliding groove 134. When the rack 140 slides, it drives the second motor 120 to slide. When the second motor 120 slides, it drives the cutting blade 123 on the second transmission shaft 121 to move synchronously, so that it can cut the cutting blade 123 as a whole. ;

[0034] A cooling assembly 200, the cooling assembly 200 comprises a support plate 230 mounted on one end of a first mounting plate 110 near one end of a workbench 310, a water tank 240 is mounted on the upper end of the support plate 230, a first hose 250 is mounted on the end of the water tank 240 near the workbench 310, a mounting rod 260 is mounted on the end of the first hose 250 away from the water tank 240, a nozzle 270 is mounted on the end of the mounting rod 260 away from the first hose 250, a second hose 281 is mounted on the end of the water tank 240 away from the first hose 250, a water pump 280 is mounted on the end of the second hose 281 away from the water tank 240, a third hose 282 is mounted on the end of the water pump 280 away from the second hose 281, and the water pump 280 is fixedly connected to the end of the support plate 230 away from the workbench 310, Four first brackets 210 are installed at one end of the workbench 310 away from the first mounting frame 131, and a collecting box 220 is installed at one end of the first bracket 210 away from the workbench 310. A third hose 282 is connected through one end of the collecting box 220 close to the support plate 230. When the cutting blade 123 cuts the curtain wall during work, a water pump 280 installed at one end of the support plate 230 injects water into the water tank 240 through the second hose 281. When the water in the water tank 240 is full, water is injected into the nozzle 270 through the first hose 250, and the water is sprayed toward the contact position between the cutting blade 123 and the curtain wall. Subsequently, the water that has contacted the curtain wall is collected in the collection box 220 from the leakage trough 340 opened at the bottom of the workbench 310, and is pumped into the water pump 280 by the third water pipe connected therethrough for circulation and utilization.

[0035] A base plate 410 is installed at one end of the workbench 310, and two inclined rods 420 are installed at one end of the base plate 410 away from the first mounting frame 131, and the other end of any one of the inclined rods 420 is connected to the corresponding second bracket 320, and two groups of fixed blocks 430 are installed on the upper end of the base plate 410, and a rotating shaft 440 is connected between any group of fixed blocks 430. A rear conveyor belt 450 is installed on the two rotating shafts 440, and a plurality of mounting grooves are opened on the conveyor belt 450. A rear electromagnet 460 is installed in any mounting groove. When working, the curtain wall is first placed on the conveyor belt 450, and then the electromagnet 460 is energized so that it is adsorbed by the electromagnet 460, and the conveyor belt 450 is further started so that the conveyor belt 450 transports the curtain wall to the lower end of each pressure rod 116.

[0036] Working principle: When working, first place the curtain wall on the conveyor belt 450, then energize the electromagnet 460 so that it is adsorbed by the electromagnet 460, and then start the conveyor belt 450 so that the conveyor belt 450 can transport the curtain wall to the lower end of each pressure rod 116, and then directly start the first motor 114, the first motor 114 drives the first transmission shaft 113 to rotate around the first bearing 112, and the first transmission shaft 113 will drive the installation cylinder 130 to rotate when rotating, and the installation cylinder will drive the coil springs on both sides when rotating. 115 moves synchronously, and the disc spring 115 drives the corresponding pressure rod 116 to move downward and act on the curtain wall to fix it when rotating. Then the first transmission shaft 113 continues to move, driving the first mounting frame 131 to move downward. During the movement, the second motor 120 is started, and the second motor 120 drives the second transmission shaft 121 to rotate around the second bearing 122. When the second transmission shaft 121 rotates, it drives the cutting blade 123 to rotate and cut the curtain wall. Then the third transmission shaft 113 is started. The third motor 142 drives the third transmission shaft 143 to rotate around the third bearing 145. The third transmission shaft 143 drives the gear 144 to rotate when rotating. The gear 144 drives the gear rack 140 meshing therewith to slide toward the other end in the second sliding groove 134 when rotating. The gear rack 140 drives the second motor 120 to slide when sliding. The second motor 120 drives the cutting blade 123 on the second transmission shaft 121 to move synchronously when sliding, so that the cutting blade 123 can be completely cut. When the cutting blade 123 cuts the curtain wall during work, the water pump 280 installed at one end of the support plate 230 injects water into the water tank 240 through the second hose 281. When the water in the water tank 240 is full, the water will be injected into the nozzle 270 through the first hose 250, and the water will be sprayed to the contact position between the cutting blade 123 and the curtain wall. Then, the water that has contacted the curtain wall will be collected in the collection box 220 from the leakage trough 340 opened at the bottom of the workbench 310, and will be pumped into the water pump 280 by the third water pipe connected through it for circulation.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automated curved special-shaped titanium alloy curtain wall processing equipment, comprising: A support assembly (300), the support assembly (300) comprising four second brackets (320), and a workbench (310) is installed on the upper ends of the four second brackets (320); A fixed cutting assembly (100), the fixed cutting assembly (100) comprising a first mounting plate (110) and a second mounting plate (111) mounted on a workbench (310), a first bearing (112) being mounted on one end of the second mounting plate (111) close to the first mounting plate (110), a first transmission shaft (113) being mounted on one end of the first bearing (112) away from the second mounting plate (111), the first transmission shaft (113) being connected to the first mounting plate (110) at one end away from the first bearing (112), two coil springs (115) being symmetrically mounted on the first transmission shaft (113), one end of each coil spring (115) being mounted with a pressure rod (116), and the first transmission shaft (113) being symmetrically mounted with two coil springs (115). 13) is installed with a mounting cylinder (130), the end of the mounting cylinder (130) away from the working plate is installed with a first mounting frame (131), the first mounting frame (131) is provided with a first sliding groove (132), the first mounting frame (131) is provided with a second sliding groove (134), the first mounting frame (131) is provided with a connecting groove, a sliding block (133) is installed in the connecting groove, the sliding block (133) is provided with a connecting hole (1311), a rack (140) is installed in the second sliding groove (134), the end of the first mounting frame (131) away from the working table (310) is installed with a second mounting frame (141), the second mounting frame (141) is away from the first mounting frame A third motor (142) is installed at one end of the second mounting frame (131); a third transmission shaft (143) is installed at one end of the inner side wall of the second mounting frame (141) close to the third motor (142); a third bearing (145) is installed at one end of the second mounting frame (141) away from the third motor (142); an end of the third bearing (145) close to the third motor (142) is connected to an end of the third transmission shaft (143) away from the third motor (142); an end of the third motor (142) close to the third bearing (145) is connected to an end of the third transmission shaft (143) away from the third bearing (145); a gear (144) is installed on the third transmission shaft (143); the gear (144) and The rack (140) is kneaded together, a second motor (120) is installed at one end of the sliding block (133) away from the second mounting frame (141), a second transmission shaft (121) is installed at one end of the second motor (120) close to the second mounting frame (141), the second transmission shaft (121) passes through the connecting hole (1311), a second bearing (122) is installed at one end of the second transmission shaft (121) away from the second motor (120), one end of the second bearing (122) away from the second motor (120) is connected to the back of the rack (140), a cutting blade (123) is installed on the second transmission shaft (121), and the cutting blade (123) passes through the first sliding groove (132); A cooling assembly (200) comprises a support plate (230) mounted on one end of a workbench (310) close to a first mounting plate (110).

2. The automatic curved special-shaped titanium alloy curtain wall processing equipment according to claim 1 is characterized by: A first motor (114) is installed at one end of the first mounting plate (110) away from the first transmission shaft (113), and an end of the first motor (114) close to the first mounting plate (110) is connected to one end of the first transmission shaft (113) on the principle of the second mounting plate (111).

3. The automatic curved special-shaped titanium alloy curtain wall processing equipment according to claim 1 is characterized by: A first transmission shaft (113) is installed through the installation cylinder (130).

4. The automatic curved special-shaped titanium alloy curtain wall processing equipment according to claim 1 is characterized by: A water tank (240) is installed on the upper end of the support plate (230); a first hose (250) is installed on one end of the water tank (240) close to the workbench (310); a mounting rod (260) is installed on one end of the first hose (250) away from the water tank (240); a nozzle (270) is installed on one end of the mounting rod (260) away from the first hose (250); a second hose (281) is installed on one end of the water tank (240) away from the first hose (250); a water pump (280) is installed on one end of the second hose (281) away from the water tank (240); a third hose (282) is installed on one end of the water pump (280) away from the second hose (281); and the water pump (280) is fixedly connected to one end of the support plate (230) away from the workbench (310).

5. The automatic curved special-shaped titanium alloy curtain wall processing equipment according to claim 1 is characterized by: Four first brackets (210) are installed at one end of the workbench (310) away from the first mounting frame (131), a collection box (220) is installed at one end of the first bracket (210) away from the workbench (310), and a third hose (282) is connected through one end of the collection box (220) close to the support plate (230).

6. The automatic curved special-shaped titanium alloy curtain wall processing equipment according to claim 1 is characterized by: A plurality of cutting grooves (330) are provided at one end of the workbench (310) close to the first mounting frame (131), and a plurality of water leakage grooves (340) are provided at one end of the workbench (310) away from the first mounting frame (131), and the lower end of any one of the water leakage grooves (340) is located at the upper end of the collection box (220).

7. The automatic curved special-shaped titanium alloy curtain wall processing equipment according to claim 1 is characterized by: A base plate (410) is installed at one end of the workbench (310), and two inclined rods (420) are installed at one end of the base plate (410) away from the first mounting frame (131), and the other end of any one of the inclined rods (420) is connected to the corresponding second bracket (320), and two groups of fixed blocks (430) are installed at the upper end of the base plate (410), and a rotating shaft (440) is connected between any group of fixed blocks (430), and a rear conveyor belt (450) is installed on the two rotating shafts (440).

8. The automatic curved special-shaped titanium alloy curtain wall processing equipment according to claim 7 is characterized by: The conveyor belt (450) is provided with a plurality of installation grooves, and a rear electromagnet (460) is installed in any one of the installation grooves.

Images