Semi-prefabricated T-shaped topological hemming PEC secondary beam and welding positioning device thereof

Abstract

The invention discloses a semi-prefabricated T-shaped topological hemming PEC secondary beam and a welding positioning device thereof.The semi-prefabricated T-shaped topological hemming PEC secondary beam comprises a PEC beam body, a plurality of bolt holes are formed in the PEC beam body, reinforcement cages are arranged on the front side and the rear side of the PEC beam body correspondingly, each reinforcement cage comprises a plurality of rectangular steel bars, a plurality of transverse tie bars are jointly welded between the rectangular steel bars, and the transverse tie bars are connected with the PEC beam body. The lower ends of the rectangular steel bars are welded to the PEC beam body, and the steel reinforcement cage is provided with hole penetrating tie bars. According to the invention, the upper flange is broken through, the combination effect of the beam and the floor slab can be improved in a manner of overlapping with the floor slab or cast-in-place together with the floor slab, the bearing capacity and rigidity of the beam are improved, so that the components are fully utilized, the steel consumption is less, and the economical efficiency is higher; and a plurality of rectangular steel bars can be accurately positioned at the position needing to be welded, so that the mounting efficiency of the reinforcement cage on the PEC secondary beam is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a semi-prefabricated T-shaped topological curled PEC secondary beam and a welding positioning device thereof. Background Art

[0002] The secondary beam is located above the main beam and mainly plays the role of transferring loads. At the junction of the main beam and the secondary beam, the main beam can be regarded as the support of the secondary beam. The length of the secondary beam entering the main beam only needs to meet the requirements of the anchorage length. The partially enclosed steel-concrete composite structure is a new type of steel-concrete composite structure formed by welding steel bars or studs in the H-shaped steel cavity and pouring concrete.

[0003] However, when the existing topological hemmed PEC beam is used as a secondary beam, the upper flange contributes less to the bearing capacity, resulting in lower overall bearing capacity and stiffness of the beam. At the same time, the component cannot be fully utilized, resulting in a large amount of steel used in the production of the secondary beam, which greatly reduces the economic efficiency.

[0004] At the same time, during the construction of the existing PEC secondary beam, a steel cage needs to be welded on it. Since the steel cage contains rectangular steel bars and the rectangular steel bars need to be set vertically, it is generally welded manually. However, manual welding has certain requirements on the technical level of workers. During the welding process, there may be welding that does not meet the requirements, such as uneven welds, different widths, inaccurate welding positions, etc., and the quality of subsequent steel cage welding cannot be guaranteed.

[0005] Therefore, it is necessary to design a semi-prefabricated T-shaped topological curled PEC secondary beam and a welding positioning device thereof to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings existing in the prior art, and a semi-prefabricated T-shaped topological curled PEC secondary beam and its welding positioning device are proposed. By opening the upper flange, the combined effect of the beam and the floor slab can be improved by overlapping with the floor slab or casting with the floor slab, thereby improving the bearing capacity and stiffness of the beam, making full use of the component, consuming less steel and being more economical. In addition, through the setting of the positioning device, it can be ensured that multiple rectangular steel bars are accurately positioned at the position where welding is required, thereby improving the installation efficiency of the steel cage on the PEC secondary beam.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A semi-prefabricated T-shaped topological curled PEC secondary beam comprises a PEC beam body, the PEC beam body is provided with a plurality of bolt holes, a steel cage is provided on both the front and rear sides of the PEC beam body, the steel cage comprises a plurality of rectangular steel bars, a plurality of transverse tie bars are welded between the plurality of rectangular steel bars, the lower ends of the plurality of rectangular steel bars are welded to the PEC beam body, and the steel cage is provided with through-hole tie bars.

[0009] A semi-prefabricated T-shaped topology curling PEC secondary beam welding positioning device, comprising a base plate, the upper end of the base plate is fixedly connected to two vertical plates, a driving motor is installed on the left side of the vertical plate located on the left side, the output shaft end of the driving motor passes through the vertical plate and is fixedly connected to a threaded rod, a rectangular block is threadedly connected to the threaded rod, the upper end of the rectangular block is fixedly connected to two telescopic rods, the telescopic ends of the two telescopic rods are commonly fixedly connected to an arc block, the upper end of the arc block is provided with a plurality of placement grooves, the rectangular block is elastically connected to the adjacent surface of the arc block by a first spring, the upper end of the rectangular block is provided with a first electromagnet, and the upper end of the base plate is fixedly connected to two positioning blocks.

[0010] Preferably, a through opening is provided in the rectangular block, and a guide rod is fixedly connected to the right side of the vertical plate located on the left side, the guide rod passes through the through opening, and the guide rod is slidably connected to the inner wall of the through opening.

[0011] Preferably, the right side of the vertical plate located on the left side is rotatably connected to two rotating rods, and a rotating plate is fixedly connected to the two rotating rods. The upper ends of the two rotating plates are provided with vertical grooves, and adjustment plates are slidably connected in the two vertical grooves. The two adjustment plates are elastically connected to the inner bottom of the vertical grooves through a third spring, and the inner bottom of the two vertical grooves are installed with a third electromagnet.

[0012] Preferably, a mounting block is fixedly connected to the right side of the vertical plate located on the left side, a pneumatic rod is fixedly connected to the upper end of the mounting block, a moving block is fixedly connected to the telescopic end of the pneumatic rod, a rack is fixedly connected to the upper end of the moving block, a first gear is provided on each of the two rotating rods, and the first gear located on the front side is meshed with the rack.

[0013] Preferably, the right side of the vertical plate on the left side is rotatably connected with a short rod, the short rod is provided with a second gear, the second gear is meshed with the first gear on the rear side, and the short rod is transmission-connected to the rotating rod on the front side through a transmission assembly.

[0014] Preferably, a first pressure sensor is installed on the left side of the vertical plate located on the right side, a second pressure sensor is provided on the inner bottom of each of the plurality of placement grooves, the movable block is conductive, two contact pieces are provided on the vertical plate located on the left side, a plurality of placement grooves are provided with a clamping assembly, the clamping assembly includes movable grooves arranged on the left and right sides of the placement groove, second electromagnets are provided on the inner walls on opposite sides of the two movable grooves, clamping blocks are slidably connected in each of the two movable grooves, and the clamping blocks are elastically connected to the corresponding second electromagnets through a second spring.

[0015] The present invention has the following beneficial effects:

[0016] 1. Compared with the existing technology, by opening the upper flange, the combined effect of the beam and the floor slab can be improved by superimposing it with the floor slab or casting it together with the floor slab. The length of the steel cage on both sides is increased and penetrates deep into the floor slab, which improves the bearing capacity and stiffness of the beam, makes full use of the components, consumes less steel and is more economical;

[0017] 2. Compared with the prior art, after placing rectangular steel bars in a plurality of placement slots on the arc block, the rectangular block can be moved to the right by the operation of the driving motor, so that the rectangular steel bars are moved to the upper end of the PEC beam body, so that it is convenient for the workers to weld the rectangular steel bars above the PEC beam body at equal distances, thereby improving the welding efficiency of the steel cage above the PEC beam body;

[0018] 3. Compared with the prior art, by setting the rotating plate and the adjusting plate, when the rectangular steel bar is tilted and hung on the arc block, the pneumatic rod is controlled to contract, and the transmission assembly, the first gear and the second gear are used to drive the two rotating rods to rotate, so that the rectangular steel bar can be adjusted. At the same time, the third electromagnet is energized to make the two adjusting plates move relatively, so that the position of the rectangular steel bar can be adjusted, avoiding the situation that the position corresponding to the steel bar is inaccurate during welding;

[0019] 4. Compared with the prior art, by setting the second electromagnet and the clamping block, when the position of the rectangular steel bar is adjusted, the two corresponding clamping blocks move relative to each other, which can limit the position of the rectangular steel bar, thereby avoiding the rectangular steel bar from being offset again during the movement.

[0020] In summary, the PEC secondary beam of the present invention is cast integrally with the floor slab, which can improve the bearing capacity and rigidity of the beam, reduce steel consumption, and improve economy. At the same time, by setting the adjustment plate and the rotating plate, the position of the rectangular steel bars can be adjusted, so that the rectangular steel bars can be accurately welded at the predetermined position later. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a semi-prefabricated T-shaped topological curled PEC secondary beam proposed by the present invention;

[0022] Figure 2 It is a structural schematic diagram of the steel cage;

[0023] Figure 3 This is the structural diagram after the steel cage and PEC secondary beam are installed;

[0024] Figure 4 for Figure 3 Schematic diagram of the structure of installing through-hole tie bars;

[0025] Figure 5 This is the structural diagram after the floor slab is poured;

[0026] Figure 6 It is a three-dimensional schematic diagram of the PEC secondary beam welding positioning device;

[0027] Figure 7 It is a schematic diagram of the rear three-dimensional structure of the PEC secondary beam welding positioning device;

[0028] Figure 8 It is a plan cross-sectional view of the PEC secondary beam welding positioning device;

[0029] Fig. 9 for Figure 8 A schematic diagram of the enlarged structure at A in the middle;

[0030] Fig.10 for Figure 8 A schematic diagram of the enlarged structure at B in the middle;

[0031] Fig.11 for Figure 8 Middle CC section;

[0032] Fig.12 for Fig.11 Schematic diagram of the enlarged structure at D in the middle.

[0033] In the figure: 1PEC beam body, 2 bolt holes, 3 transverse reinforcement, 4 rectangular reinforcement, 5 through-hole reinforcement, 6 bottom plate, 7 vertical plate, 8 positioning block, 9 first pressure sensor, 10 mounting block, 11 pneumatic rod, 12 contact piece, 13 moving block, 14 rotating rod, 15 rotating plate, 16 adjusting plate, 17 threaded rod, 18 rectangular block, 19 first electromagnet, 20 arc block, 21 first spring, 22 telescopic rod, 23 driving motor, 24 guide rod, 25 placement slot, 26 second pressure sensor, 27 moving slot, 28 second electromagnet, 29 second spring, 30 third electromagnet, 31 rack, 32 first gear, 33 transmission assembly, 34 third spring, 35 vertical slot, 36 second gear, 37 short rod. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] Reference Figure 1-Figure 12 A semi-prefabricated T-shaped topological curled PEC secondary beam comprises a PEC beam body 1, wherein the upper flange of the PEC beam body 1 is replaced with an inverted T-shaped section formed by a web and a lower flange, a plurality of bolt holes 2 are arranged on the PEC beam body 1, and a steel cage is arranged on both the front and rear sides of the PEC beam body 1, the steel cage comprises a plurality of rectangular steel bars 4, a plurality of transverse tie bars 3 are welded between the plurality of rectangular steel bars 4, the lower ends of the plurality of rectangular steel bars 4 are welded to the PEC beam body 1, and the steel cage is provided with through-hole tie bars 5.

[0036] The present invention also proposes a semi-prefabricated T-shaped topology curling PEC secondary beam welding positioning device, comprising a base plate 6, the upper end of the base plate 6 is fixedly connected to two vertical plates 7, a driving motor 23 is installed on the left side of the vertical plate 7 on the left side, the driving motor 23 is a servo motor, and can drive the threaded rod 17 to rotate clockwise or counterclockwise, the output shaft end of the driving motor 23 passes through the vertical plate 7 and is fixedly connected to the threaded rod 17, a rectangular block 18 is threadedly connected to the threaded rod 17, the upper end of the rectangular block 18 is fixedly connected to two telescopic rods 22, the telescopic ends of the two telescopic rods 22 are commonly fixedly connected to an arc block 20, the upper end of the arc block 20 is provided with a plurality of placement grooves 25, the rectangular block 18 and the adjacent surfaces of the arc block 20 are elastically connected by a first spring 21, the upper end of the rectangular block 18 is provided with a first electromagnet 19, the arc block 20 is made of iron material, and the first electromagnet 19 generates an attractive force on the arc block 20 after being energized, and a control switch is provided, and the control switch can control the first electromagnet 19 to be energized A period of time, during which time the arc block 20 moves downward, so that the multiple rectangular steel bars 4 are separated from the placement groove 25, so that the rectangular block 18 can drive the arc block 20 to move back, so as to facilitate the placement of the next rectangular steel bar 4. Two positioning blocks 8 are fixedly connected to the upper end of the bottom plate 6. The two positioning blocks 8 are both U-shaped and contact the left and right sides of the PEC beam body 1, and the width of the two positioning blocks 8 is twice the width of the PEC beam body 1, so that when welding, the rear side of the PEC beam body 1 is first contacted with the rear inner wall of the positioning block 8, and the multiple rectangular steel bars 4 are welded to the front side of the PEC beam body 1. When it is necessary to weld the rectangular steel bars to the rear side of the rectangular steel bars 4, it is only necessary to push the PEC beam body 1 to the front side so that the front side of the PEC beam body 1 contacts the front inner walls of the two positioning blocks 8. A through opening is provided in the rectangular block 18, and a guide rod 24 is fixedly connected to the right side of the vertical plate 7 on the left side. The guide rod 24 passes through the through opening, and the guide rod 24 is slidably connected to the inner wall of the through opening.

[0037] Among them, the right side of the vertical plate 7 located on the left side is rotatably connected to two rotating rods 14, and the two rotating rods 14 are fixedly connected to rotating plates 15. The upper ends of the two rotating plates 15 are provided with vertical slots 35, and the two vertical slots 35 are slidably connected with adjustment plates 16. The two adjustment plates 16 are elastically connected to the inner bottom of the vertical slots 35 through third springs 34. The inner bottoms of the two vertical slots 35 are installed with third electromagnets 30. The two adjustment plates 16 are made of magnetic materials. When the third electromagnet 30 is energized, a repulsive force is generated on the two adjustment plates 16. An external power supply is provided. The external power supply, two contact pieces 12, a moving block 13 and the two third electromagnets 30 form a loop through wires. Copper wires are provided in the two adjustment plates 16. Conductive sheets are provided on the inner walls of the left and right sides of the two vertical slots 35. The external power supply, multiple conductive sheets, copper wires and multiple second electromagnets 28 form a loop through wires.

[0038] Among them, the right side of the vertical plate 7 on the left is fixedly connected with a mounting block 10, the upper end of the mounting block 10 is fixedly connected with a pneumatic rod 11, the telescopic end of the pneumatic rod 11 is fixedly connected with a moving block 13, the upper end of the moving block 13 is fixedly connected with a rack 31, and the two rotating rods 14 are each provided with a first gear 32, the first gear 32 located on the front side is meshed with the rack 31, and the right side of the vertical plate 7 on the left is rotatably connected with a short rod 37, the short rod 37 is provided with a second gear 36, the second gear 36 is meshed with the first gear 32 located on the rear side, the short rod 37 is connected to the rotating rod 14 on the front side through a transmission assembly 33, the transmission assembly 33 includes sprockets arranged on the front rotating rod 14 and the short rod 37, and the two sprockets are connected through chain transmission.

[0039] Among them, a first pressure sensor 9 is installed on the left side of the vertical plate 7 located on the right side, and a controller is provided. When multiple first pressure sensors 9 generate electrical signals, they will be transmitted to the controller. The controller controls the pneumatic rod 11 to contract. Second pressure sensors 26 are provided on the inner bottoms of multiple placement grooves 25. The second pressure sensors 26 generate electrical signals and transmit them to the controller. The controller controls the first pneumatic rod 11 to contract. At the same time, the controller controls multiple second electromagnets 28 to cut off power. The controller is connected in series in the circuit of the second electromagnet 28. The moving block 13 is conductive. Two contact pieces 12 are provided on the vertical plate 7 located on the left side. A clamping assembly is provided in each of the placement grooves 25. The clamping assembly includes a moving groove 27 arranged on the left and right sides of the placement groove 25. The inner walls of the two moving grooves 27 on the opposite sides are provided with a second electromagnet 28. The two moving grooves 27 are slidably connected with a clamping block, and the clamping block is elastically connected to the corresponding second electromagnet 28 through a second spring 29.

[0040] The functional principle of the present invention can be explained by the following operation mode: first, the PEC beam body 1 is placed between the two positioning blocks 8 on the bottom plate 6, and then the plurality of rectangular steel bars 4 are positioned at the upper end of the PEC beam body 1 by the welding positioning device. At this time, the staff can weld the PEC beam body 1 with the plurality of rectangular steel bars 4, and then adjust the position of the PEC beam body 1, and then weld the plurality of rectangular steel bars 4 on the rear side of the PEC beam body 1;

[0041] After the rectangular steel bar 4 is welded, multiple transverse tie bars 3 can be fixed to the rectangular steel bar 4, and then multiple through-hole tie bars 5 can be installed. When the installation is complete, the PEC beam body 1 can be fixed to the columns on both sides by bolts, and then the PEC beam and the floor slab can be cast together.

[0042] When the welding positioning device is used, firstly, a plurality of rectangular steel bars 4 are sequentially placed into a plurality of placement grooves 25. When the plurality of rectangular steel bars 4 are placed, the plurality of second pressure sensors 26 generate electrical signals, which are transmitted to the controller. The controller controls the pneumatic rod 11 to contract, so that the moving block 13 drives the rack 31 to move downward, so that the rack 31 drives the first gear 32 located on the front side to rotate, so that the rotating rod 14 located on the front side rotates. At this time, the short rod 37 is driven to rotate through the transmission assembly 33, so that the second gear 36 drives the first gear 32 and the rotating rod 14 located on the rear side to rotate, so that the two rotating plates 15 drive the corresponding adjustment plates 16 to rotate relative to each other.

[0043] During the placement of the rectangular steel bar 4, the upper left corner or the upper right corner of the rectangular steel bar 4 may be hung on the placement groove 25 due to the center, so that the rectangular steel bar 4 is tilted to the front or rear side. At this time, the two adjustment plates 16 are rotated toward the middle to rotate the rectangular steel bar 4 to a vertical state;

[0044] When the two adjustment plates 16 are rotated to a horizontal state, the moving block 13 contacts the two contact pieces 12, so that the third electromagnet 30 is energized. After the third electromagnet 30 is energized, the third electromagnet 30 generates a repulsive force on the corresponding adjustment plate 16, so that the two adjustment plates 16 move relative to each other, and then the rectangular steel bar 4 is pushed, so as to ensure that the central axis of the rectangular steel bar 4 is aligned with the central axis of the placement slot 25;

[0045] When the two adjustment plates 16 move to the limit position, the position of the round steel has been adjusted, and the copper wire will contact the two conductive sheets, so that the multiple second electromagnets 28 are energized. After the multiple second electromagnets 28 are energized, repulsive forces will be generated on the corresponding clamping blocks, so that the corresponding two clamping blocks move relative to each other, thereby clamping the rectangular steel bar 4;

[0046] At this time, the driving motor 23 can be started to make the threaded rod 17 rotate clockwise, so that the rectangular block 18 drives the rectangular steel bar 4 to move rightward. When the rectangular block 18 contacts the first pressure sensor 9, a signal is generated and transmitted to the controller. The controller controls the multiple second electromagnets 28 to cut off the power. Under the elastic action of the second spring 29, the multiple clamping blocks are moved back, and the multiple pneumatic rods 11 are controlled to stretch, so that the rotating plate 15 is reset. In the process of resetting the rotating plate 15, the moving block 13 is separated from the two contact pieces 12, so that the adjustment plate 16 is reset;

[0047] It is worth mentioning that, since the clamping block is made of magnetic material, it has a certain attraction to the rectangular steel bar 4, but since the distances between the two clamping blocks and the rectangular steel bar 4 are consistent, the attraction to the rectangular steel bar 4 is consistent, so that the attraction of the two clamping blocks to the rectangular steel bar 4 cancels each other, so that the rectangular steel bar 4 will not move when the clamping block moves back;

[0048] At this time, the staff can weld a plurality of rectangular steel bars 4 on the PEC beam body 1. After the welding is completed, the first electromagnet 19 can be controlled to be energized for a period of time, so that the first electromagnet 19 attracts the arc block 20 to move downward, so that the rectangular steel bar 4 is separated from the placement groove 25, and then the driving motor 23 is controlled to drive the threaded rod 17 to rotate counterclockwise, so that the rectangular block 18 is reset. After a period of time, the first electromagnet 19 is powered off, so that the arc block 20 is reset;

[0049] Then, new rectangular steel bars 4 are placed in the placement grooves 25, and the PEC beam body 1 is moved, so that a plurality of rectangular steel bars 4 can be welded to the rear side of the PEC beam body 1 according to the above placement.

[0050] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A semi-prefabricated T-shaped topology curled PEC secondary beam, comprising a PEC beam body (1), characterized in that: The PEC beam body (1) is provided with a plurality of bolt holes (2), and the front and rear sides of the PEC beam body (1) are both provided with steel cages, the steel cages comprising a plurality of rectangular steel bars (4), a plurality of transverse tie bars (3) being welded between the plurality of rectangular steel bars (4), the lower ends of the plurality of rectangular steel bars (4) being welded to the PEC beam body (1), and the steel cages are provided with through-hole tie bars (5).

2. A welding positioning device for a semi-prefabricated T-shaped topology curled PEC secondary beam in claim 1, characterized in that: The invention comprises a bottom plate (6), the upper end of which is fixedly connected to two vertical plates (7), a driving motor (23) is installed on the left side of the vertical plate (7) located on the left side, the output shaft end of the driving motor (23) passes through the vertical plate (7) and is fixedly connected to a threaded rod (17), a rectangular block (18) is threadedly connected to the threaded rod (17), the upper end of the rectangular block (18) is fixedly connected to two telescopic rods (22), the telescopic ends of the two telescopic rods (22) are commonly fixedly connected to an arc block (20), the upper end of the arc block (20) is provided with a plurality of placement grooves (25), the adjacent surfaces of the rectangular block (18) and the arc block (20) are elastically connected via a first spring (21), the upper end of the rectangular block (18) is provided with a first electromagnet (19), and the upper end of the bottom plate (6) is fixedly connected to two positioning blocks (8).

3. A semi-prefabricated T-shaped topology curled PEC secondary beam welding positioning device according to claim 2, characterized in that: A through opening is provided in the rectangular block (18), and a guide rod (24) is fixedly connected to the right side of the vertical plate (7) on the left side. The guide rod (24) passes through the through opening, and the guide rod (24) is slidably connected to the inner wall of the through opening.

4. A semi-prefabricated T-shaped topology curled PEC secondary beam welding positioning device according to claim 2, characterized in that: The right side of the vertical plate (7) located on the left side is rotatably connected to two rotating rods (14), and the two rotating rods (14) are fixedly connected to a rotating plate (15). The upper ends of the two rotating plates (15) are provided with vertical grooves (35), and the two vertical grooves (35) are slidably connected with adjustment plates (16). The two adjustment plates (16) are elastically connected to the inner bottom of the vertical grooves (35) through third springs (34), and the inner bottoms of the two vertical grooves (35) are installed with third electromagnets (30).

5. A semi-prefabricated T-shaped topology curled PEC secondary beam welding positioning device according to claim 1, characterized in that: A mounting block (10) is fixedly connected to the right side of the vertical plate (7) located on the left side, a pneumatic rod (11) is fixedly connected to the upper end of the mounting block (10), a moving block (13) is fixedly connected to the telescopic end of the pneumatic rod (11), a rack (31) is fixedly connected to the upper end of the moving block (13), and a first gear (32) is provided on each of the two rotating rods (14), and the first gear (32) located on the front side is meshed with the rack (31).

6. A semi-prefabricated T-shaped topology curled PEC secondary beam welding positioning device according to claim 5, characterized in that: The right side of the vertical plate (7) located on the left side is rotatably connected to a short rod (37), the short rod (37) is provided with a second gear (36), the second gear (36) is meshed with the first gear (32) located on the rear side, and the short rod (37) is transmission-connected to the rotating rod (14) located on the front side via a transmission assembly (33).

7. A semi-prefabricated T-shaped topology curled PEC secondary beam welding positioning device according to claim 2, characterized in that: A first pressure sensor (9) is installed on the left side of the vertical plate (7) located on the right side, and a second pressure sensor (26) is provided at the inner bottom of each of the plurality of placement grooves (25). The moving block (13) is conductive, and two contact pieces (12) are provided on the vertical plate (7) located on the left side. Each of the plurality of placement grooves (25) is provided with a clamping assembly, and the clamping assembly includes moving grooves (27) arranged on the left and right sides of the placement grooves (25). The inner walls of the two moving grooves (27) on the opposite sides are provided with a second electromagnet (28). The two moving grooves (27) are slidably connected with a clamping block, and the clamping block is elastically connected to the corresponding second electromagnet (28) through a second spring (29).

Images