Diode braiding device
By introducing limit rods and heating components into the diode tape braiding device, the plastic film and the carrier tape are ensured to be closely fitted, and the packaging skew problem is solved, which improves the packaging effect and discharge efficiency.
Patent Information
- Application Number
- CN202421116888.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The existing diode tape braiding packaging device does not limit the plastic film during the packaging process, resulting in the packaging being easily skewed and affecting the packaging effect.
A diode tape braiding device including a workbench, feed table, carrier groove, operating box, discharge roller, discharge wheel, limit rod and heating assembly is designed to ensure that the plastic film is in the When melted, it fits closely with the carrier tape to avoid skewness and improves discharge efficiency through the discharge assembly.
The limiting process of plastic film is improved to ensure that it is stable when melting and packaging, avoid skew, improve the packaging effect of the carrier tape, simplify the operation process, and improve the discharge efficiency.
Smart Images
Figure CN222247845U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of diode processing, in particular to a diode braiding device. Background Art
[0002] The taping and packaging of diodes is an important process step. The production process is very complex and involves multiple machines and equipment. The quality and stability of the diodes are ensured by using specialized equipment and complex process flows.
[0003] There are some diode tape packaging devices in the prior art, such as the utility model patent document with authorization announcement number "CN213705896U" and patent name "A diode packaging mechanism", which discloses a diode packaging mechanism. The diode packaging structure includes a guide rail, a guide roller, a pressure wheel, a driven wheel and a meshing wheel.
[0004] When the diode needs to be packaged, one end of the braid is wound around the driving wheel, and the braid slides in the guide rail under the drive of the driving wheel. One end of the tape is attached to the braid through the guide roller, and is tightly fitted with the braid under the drive of the pressing wheel, the clamping mechanism, the driven wheel and the meshing wheel to complete the packaging. However, when some existing diodes are packaged with the braid, the plastic film packaged with the braid is not limited, so that the packaging of the braid is easily skewed, and the packaging effect of the braid is poor. Utility Model Content
[0005] The utility model aims to address the deficiencies in the prior art and to propose a diode braiding device, which is used to solve the technical problem mentioned in the background technology that some of the existing diode braids fail to limit the plastic film encapsulated with the braids during packaging and processing, thereby making the packaging of the braids prone to skew, thereby resulting in poor packaging effect of the braids.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A diode braiding device comprises a workbench, a feed table is fixedly provided on the workbench, a tape carrier slot is provided on the top of the feed table, a tape carrier is slidably provided in the tape carrier slot, an operation box is provided on the workbench, a first discharging roller is rotatably provided on the operation box, a first discharging wheel is fixedly provided on the first discharging roller, a plastic film is rolled up on the first discharging wheel, and also comprises a first positioning block fixedly provided on the feed table, a heating component is provided on the feed table and located between the first discharging wheel and the first positioning block, two limiting rods are provided on the first positioning block and are parallel to the first discharging roller, one of the limiting rods is fixedly penetrated through the first positioning block, and the other limiting rod is rotatably penetrated through the first positioning block and is located above the fixed limiting rod, when the tape carrier moves in the tape carrier slot, Two fourth positioning blocks are slidably penetrated on the two limit rods, and the two fourth positioning blocks are both located above the feed table and relatively arranged on both sides of the carrier slot, and each of the fourth positioning blocks is threadedly penetrated with a first bolt that abuts against one of the rotating limit rods, and the limit rod is located above the carrier slot, and one end of the plastic film is pulled out from the first discharging wheel and slidably wrapped around the side of the two limit rods away from the first discharging wheel, and passes between the limit rod located below and the carrier, and this part of the plastic film is further slidably penetrated through the heating component, and the heating component is abutted against the plastic film and the carrier, and the operating box is provided with a discharging component located between the first discharging wheel and the heating component, and the discharging component is used for rolling and abutting to bring out the carrier after coating.
[0008] Working principle:
[0009] First, start the heating component and the discharging component, then the operator puts the carrier tape into the carrier tape slot, and then pulls the plastic film out from the first discharging wheel, so that the plastic film is wrapped around the two limit rods on the side away from the first discharging wheel, and the plastic film passes between the limit rods located below and the carrier tape, so that the plastic film and the carrier tape are in contact with each other.
[0010] Next, the operator slides the plastic film and the carrier tape through the bottom of the heating component at the same time. During this process, the bottom of the heating component slides against the plastic film and heats the plastic film to melt it. The melted plastic film flows onto the carrier tape and is fixed on the carrier tape after solidification.
[0011] Afterwards, the discharging assembly in operation rolls and abuts the coated portion of the carrier tape out of the carrier tape slot.
[0012] The beneficial effects of the utility model are:
[0013] During the use of the utility model, the operator makes the plastic film pass through the two limiting rods and then slide it onto the carrier tape, and makes the plastic film and the carrier tape slide and abut against each other through the bottom of the heating component at the same time, so as to package the carrier tape, thereby adding a limiting process of the plastic film, making the plastic film more stable during the melting packaging, avoiding the plastic film from being skewed and thus affecting the packaging of the carrier tape, and improving the packaging effect of the carrier tape. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 A top view of an embodiment of the utility model;
[0015] Figure 2 for Figure 1 A top view with the carrier tape and plastic film removed;
[0016] Figure 3 for Figure 1 main view.
[0017] Explanation of the accompanying drawings: workbench 1, feeding table 2, carrier slot 3, carrier 4, operating box 5, first discharging roller 6, first discharging wheel 7, plastic film 8, first positioning block 9, limiting rod 10, first bolt 11, heating element 12, heating block 13, motor 14, discharging cylinder 15, rotating shaft 16, guide rod 17, second positioning block 18, spring bolt 19, limiting block 20, positioning rod 21, third positioning block 22, second bolt 23, limiting plate 24, protective edging 25, positioning element 26, second discharging roller 27, second winding wheel 28, sliding slot 29, positioning box 30, flattening rod 31, third bolt 32, fourth limiting block 33. DETAILED DESCRIPTION
[0018] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0019] like Figure 1 , Figure 2 and Figure 3As shown, a diode braiding device comprises a workbench 1, on which a feed table 2 is fixedly provided, a carrier groove 3 is provided on the top of the feed table 2, a carrier belt 4 is slidably provided in the carrier groove 3, an operation box 5 is provided on the workbench 1, a first discharging roller 6 is rotatably provided on the operation box 5, a first discharging wheel 7 is fixedly provided on the first discharging roller 6, a plastic film 8 is rolled up on the first discharging wheel 7, and also comprises a first positioning block 9 fixedly provided on the feed table 2, a heating component located between the first discharging wheel 7 and the first positioning block 9 is provided on the feed table 2, two limiting rods 10 parallel to the first discharging roller 6 are provided on the first positioning block 9, one of the limiting rods 10 is fixedly penetrated through the first positioning block 9, and the other limiting rod 10 is rotatably penetrated through the first positioning block 9 and is located above the fixed limiting rod 10, when the carrier belt 4 moves in the carrier groove 3 When the cam 3 is moved, two fourth positioning blocks 33 are slidably penetrated on the two limit rods 10, and the two fourth positioning blocks 33 are both located above the feed table 2 and are relatively arranged on both sides of the carrier slot 3. Each of the fourth positioning blocks 33 is threadedly penetrated with a first bolt 11 that abuts against one of the rotating limit rods 10. The limit rod 10 is located above the carrier slot 3, and one end of the plastic film 8 is pulled out from the first discharge wheel 7 and slidably wound around the two limit rods 10 to the side away from the first discharge wheel 7, and passes between the limit rod 10 located below and the carrier 4, and this part of the plastic film 8 is further slidably penetrated through the heating component, and the heating component is abutted against the plastic film 8 and the carrier 4. The operating box 5 is provided with a discharge component located between the first discharge wheel 7 and the heating component, and the discharge component is used to roll and abut to bring out the coated carrier 4.
[0020] During the use of the utility model, the operator makes the plastic film 8 pass through the two limiting rods 10 and then slide it onto the carrier 4, and makes the plastic film 8 and the carrier 4 slide and abut against each other through the bottom of the heating component at the same time, so as to package the carrier 4, and the limiting process of the plastic film 8 is added, so that the plastic film 8 is more stable during the melting packaging, and the plastic film 8 is prevented from being skewed and offset, thereby affecting the packaging of the carrier 4, and the packaging effect of the carrier 4 is improved.
[0021] like Figure 1 , Figure 2 and Figure 3As shown, the heating assembly includes two heating elements 12 located between the first discharge wheel 7 and the first positioning block 9, and two heating blocks 13. The two heating elements 12 are relatively fixed on the feed table 2 and are respectively located on both sides of the carrier slot 3. The two heating blocks 13 are relatively fixed on the two heating elements 12, and the bottoms of the two heating blocks 13 are both located above the carrier slot 3. The heating blocks 13 abut the plastic film 8 on the carrier 4. When the carrier 4 is transported in the carrier slot 3, the heating blocks 13 are pressed on the plastic film 8, and the plastic film 8 passes through the bottom of the heating blocks 13. This design method allows the bottom of the heating block 13 to slide against the plastic film 8 and the carrier 4, so that the melted plastic film 8 can fit the carrier 4 more closely, achieving rapid sealing, and has a simple structure for easy operation. Figure 1 , Figure 2 and Figure 3 As shown, the feeding platform 2 also includes four spring bolts 19, and the feeding platform 2 is correspondingly fixed with four second positioning blocks 18 through the four spring bolts 19. The four second positioning blocks 18 are grouped in pairs, and the two second positioning blocks 18 in each group are respectively located on both sides of the carrier slot 3. A guide rod 17 is also penetrated on the two second positioning blocks 18 in each group. The guide rod 17 is located above the carrier slot 3 and is used to prevent the carrier 4 and the plastic film 8 from escaping from the carrier slot 3 after abutting against the plastic film 8. When the plastic film 8 slides and abuts against the two limit rods 10 that are arranged on the side away from the first discharge wheel 7, the part of the plastic film 8 is then slid and abutted from the guide rod 17 adjacent to the limit rod 10, the heating block 13 and the bottom of the guide rod 17 adjacent to the discharge cylinder 15 in turn. This design method guides and limits the plastic film 8 that is about to be melted through the guide rod 17 adjacent to the limit rod 10, so as to prevent the plastic film 8 from being skewed when melting and thus affecting the packaging effect of the braid; the guide rod 17 adjacent to the discharge cylinder 15 is also used to guide and limit the melted and packaged braid, so that the discharge cylinder 15 can accurately rotate to bring out the packaged braid; the second positioning block 18 is also used through the spring bolt 19 to adjust the tightening force of the guide rod 17 to adapt to plastic films 8 of different thicknesses, and the structure is simple and the effect is good.
[0022] like Figure 1 , Figure 2 and Figure 3As shown, the discharging assembly includes a motor 14 fixedly mounted on the operating box 5 and a discharging cylinder 15 with a rubber surface. A rotating shaft 16 parallel to the first discharging roller 6 is fixedly mounted at the output end of the motor 14. The discharging cylinder 15 is fixedly mounted on the rotating shaft 16 and the two are coaxial. The discharging cylinder 15 is located between the heating element 12 and the first discharging wheel 7. When the plastic film 8 is covered on the carrier belt 4 through the heating block 13, the discharging cylinder 15 rotates to abut against the plastic film 8 and drive the plastic film 8 and the carrier belt 4 to move simultaneously. When the carrier tape 4 needs to be coated, the operator slides the carrier tape 4 into the carrier tape slot 3, then slides the plastic film 8 to abut against the side of the two limit rods 10 away from the first discharge wheel 7, and slides and pulls out the part of the plastic film 8 from the bottom of the working heating block 13, so as to melt the part of the plastic film 8 and package it with the carrier tape 4. After that, the operator slides the packaged part of the carrier tape 4 through the discharge cylinder 15 and starts the motor 14. The motor 14 drives the rotating shaft 16 and the discharge cylinder 15 to rotate through its output end. The discharge cylinder 15 rotates and pulls out the partially packaged carrier tape 4, so that the plastic film 8 slides through the bottom of the heating block 13 to melt, so as to package the carrier tape 4. This design method avoids the operator from manually pulling out the coated carrier tape 4 for a long time, freeing the operator's hands, and improves the discharge efficiency through the mechanical structure. The structure is simple and the effect is good.
[0023] like Figure 1 , Figure 2 and Figure 3 As shown, the operating box 5 is fixed with a limit block 20 located above the first positioning block 9, and a positioning rod 21 that is opposite to and parallel to the limit rod 10 is rotatably provided on the limit block 20, and two third positioning blocks 22 are slidably sleeved on the positioning rod 21, and each of the third positioning blocks 22 is threaded with a second bolt 23 that abuts against the positioning rod 21. When it is necessary to rotate and package the plastic film 8, the operator rotates the two second bolts 23 to separate them from the positioning rod 21, and then slides the two third positioning blocks 22 back and forth until the plastic film 8 sliding on the positioning rod 21 abuts and slides relative to the two third positioning blocks 22, and at this time, the two second bolts 23 are screwed in to abut against the positioning rod 21. This design method is convenient for limiting and leveling the plastic film 8, so that the plastic film 8 can slide smoothly relative to the carrier 4, thereby improving the laminating efficiency.
[0024] like Figure 1 , Figure 2 and Figure 3As shown, two opposing limiting plates 24 are fixedly arranged on the feed table 2. The two limiting plates 24 are oppositely arranged on both sides of the carrier slot 3, and each limiting plate 24 is provided with a protective edging 25 on the side wall away from the carrier slot 3. When the carrier tape 4 is being packaged, the carrier tape 4 always slides relative to the bottom of the two limiting plates 24. This design makes it easy to limit the carrier tape 4, not only to make it slide smoothly, but also to make the carrier tape 4 wrinkle flat, and then accurately packaged with the plastic film 8, and the protective edging 25 protects the operator to avoid scratching the operator. Figure 1 , Figure 2 and Figure 3 As shown, a positioning member 26 is fixedly provided on the workbench 1, and a second discharging roller 27 parallel to the first discharging roller 6 is rotatably provided on the positioning member 26, and a second winding wheel 28 is fixedly provided on the second discharging roller 27, and the carrier tape 4 is wound on the second winding wheel 28, and one end of the carrier tape 4 is pulled out from the second winding wheel 28 and slidably arranged in the carrier tape slot 3, and the carrier tape 4 slidingly arranged in the carrier tape slot 3 is slidably abutted against the bottom of the limiting plate 24. This design method is convenient for installing the unpackaged carrier tape 4, and is convenient for the carrier tape 4 to slide smoothly in the carrier tape slot 3, and the structure is simple and the effect is good. Figure 1 , Figure 2 and Figure 3 As shown, a positioning box 30 with a sliding groove 29 is fixed on the positioning member 26, the opening of the positioning box 30 is in contact with one side of the feed table 2, and the positioning box 30 is arranged between the second winding wheel 28 and the limit plate 24, a flattening rod 31 is vertically slidably arranged in the sliding groove 29, and the positioning box 30 has a row of threaded holes vertically distributed and opposite to the limit plate 24, and also includes a third bolt 32, the third bolt 32 is bolted through any threaded hole and abuts against the flattening rod 31. When it is necessary to package carrier tapes 4 of different thicknesses, the operator first pulls out the carrier tape 4 on the second winding wheel 28 and passes it between the flattening rod 31 and the feed table 2, and then slides the carrier tape 4 into the carrier tape groove 3. At this time, the operator slides the flattening rod 31 vertically until the flattening rod 31 abuts against the feed table 2, and the carrier belt 4 slides relative to the flattening rod 31, and then screws the third bolt 32 into any threaded hole and is threadedly connected to the flattening rod 31. This design method is convenient for abutting and limiting the carrier belts 4 of different thicknesses, and the adjustment method is simple and easy to operate.
[0025] Working principle:
[0026] First, the operator pulls out the carrier tape 4 on the second take-up wheel 28 and passes it through between the flattening rod 31 and the feed table 2 , and then slides the carrier tape 4 into the carrier tape slot 3 .
[0027] At this time, the operator slides the paving rod 31 vertically until it abuts against the feed table 2. At this time, the carrier belt 4 slides relative to the paving rod 31, and then the third bolt 32 is screwed into any threaded hole and threadedly connected with the paving rod 31.
[0028] After that, the operator slides the carrier tape 4 through the two limiting plates 24 and the bottom of one of the limiting rods 10 adjacent to the carrier tape slot 3. Next, the operator pulls the plastic film 8 out of the first discharge wheel 7, and slides the plastic film 8 in sequence to abut against the side of the positioning rod 21 and the two limiting rods 10 that are away from the first discharge wheel 7, and then slides the plastic film 8 through the bottom of one of the limiting rods 10 adjacent to the carrier tape slot 3, and makes the part of the plastic film 8 fit the carrier tape 4. In this process, the plastic film 8 slidingly arranged on the positioning rod 21 always rotates between the two third positioning blocks 22, and the plastic film 8 slidingly arranged on the limiting rod 10 always slides between the two fourth positioning blocks 33.
[0029] Next, the operator starts the heating element 12 through the heating switch provided on the operation box 5, and the working heating element 12 heats the heating block 13. After that, the operator slides and abuts the guide rod 17 adjacent to the limit rod 10, the heating block 13 and the bottom of the guide rod 17 adjacent to the discharge cylinder 15 and pulls out the plastic film 8 synchronously with the braid 4, so as to melt the plastic film 8 and make it fall on the carrier tape 4 to achieve packaging.
[0030] Afterwards, the operator slides the packaged part of the carrier tape 4 through the discharge barrel 15 and starts the motor 14 through the power switch also provided on the operating box 5. The motor 14 drives the rotating shaft 16 and the discharge barrel 15 to rotate through its output end. The discharge barrel 15 rotates and abuts against the packaged carrier tape 4, thereby continuously rotating outward to bring out the packaged carrier tape 4, and makes the plastic film 8 continuously slide and abut against the heating block 13 to realize melting and packaging.
[0031] When it is necessary to limit and flatten the plastic films 8 of different widths, the operator rotates the two second bolts 23 to separate them from the positioning rod 21, and then slides the two third positioning blocks 22 back and forth until the plastic film 8 sliding on the positioning rod 21 slides in relative abutment with the two third positioning blocks 22, at which time the two second bolts 23 are screwed in to make them abut against the positioning rod 21; then, the operator rotates the two first bolts 11 to separate the two first bolts 11 from the rotating limiting rod 10, and then slides the two fourth positioning blocks 33 back and forth until the plastic film 8 sliding on the limiting rod 10 slides in relative abutment with the two fourth positioning blocks 33, at which time the two first bolts 11 are screwed in to make them abut against the rotating limiting rod 10.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A diode taping device, comprising a workbench (1), characterized in that: The workbench (1) is provided with a feed table (2), the top of the feed table (2) is provided with a carrier groove (3), a carrier belt (4) is slidably arranged in the carrier groove (3), the workbench (1) is provided with an operation box (5), a first discharge roller (6) is rotatably arranged on the operation box (5), a first discharge wheel (7) is fixedly provided on the first discharge roller (6), a plastic film (8) is rolled up on the first discharge wheel (7), and also includes a first positioning block ( 9), a heating component is provided on the feeding table (2) and is located between the first discharge wheel (7) and the first positioning block (9), and two limiting rods (10) are provided on the first positioning block (9) and are parallel to the first discharge roller (6), one of the limiting rods (10) is fixedly penetrated through the first positioning block (9), and the other limiting rod (10) is rotatably penetrated through the first positioning block (9) and is located above the fixed limiting rod (10), when the carrier tape (4) moves in the carrier tape slot (3), Two fourth positioning blocks (33) are slidably inserted on the two limit rods (10), and the two fourth positioning blocks (33) are both located above the feed platform (2) and are relatively arranged on both sides of the carrier slot (3). A first bolt (11) is threadedly inserted on each of the fourth positioning blocks (33) and is in contact with one of the rotating limit rods (10). The limit rod (10) is located above the carrier slot (3), and one end of the plastic film (8) is pulled away from the first discharge wheel (7) and slides around The two limiting rods (10) are arranged to face away from the side of the first discharge wheel (7), and pass through between the limiting rod (10) located below and the carrier tape (4), and the portion of the plastic film (8) further slides through the heating component, and the heating component is abutted against the plastic film (8) and the carrier tape (4). The operating box (5) is provided with a discharge component located between the first discharge wheel (7) and the heating component, and the discharge component is used for rolling and abutting to bring out the carrier tape (4) after coating.
2. A diode braiding device according to claim 1, characterized in that: The heating assembly comprises two heating elements (12) located between the first discharge wheel (7) and the first positioning block (9), and two heating blocks (13). The two heating elements (12) are relatively fixed on the feed table (2) and the two heating elements (12) are respectively located on both sides of the carrier slot (3). The two heating blocks (13) are relatively fixed on the two heating elements (12) and the bottoms of the two heating blocks (13) are both located above the carrier slot (3). The heating block (13) abuts the plastic film (8) against the carrier (4). When the carrier (4) is transported in the carrier slot (3), the heating block (13) is pressed on the plastic film (8), and the plastic film (8) passes through the bottom of the heating block (13).
3. A diode taping device according to claim 2, characterized in that: The discharging assembly comprises a motor (14) fixedly mounted on the operating box (5) and a discharging cylinder (15) whose surface is made of rubber material. The output end of the motor (14) is fixedly mounted with a rotating shaft (16) parallel to the first discharging roller (6). The discharging cylinder (15) is fixedly mounted on the rotating shaft (16) and the two are coaxial. The discharging cylinder (15) is located between the heating element (12) and the first discharging wheel (7). When the plastic film (8) is covered on the carrier belt (4) through the heating block (13), the discharging cylinder (15) rotates to abut against the plastic film (8) and drive the plastic film (8) and the carrier belt (4) to move simultaneously.
4. A diode braiding device according to claim 2, characterized in that: It also includes four spring bolts (19) arranged on the feed table (2), and the feed table (2) is fixed with four second positioning blocks (18) correspondingly through the four spring bolts (19), and the four second positioning blocks (18) are grouped in pairs, and the two second positioning blocks (18) in each group are respectively located on both sides of the carrier slot (3), and a guide rod (17) is simultaneously passed through the two second positioning blocks (18) in each group, and the guide rod (17) is located above the carrier slot (3) and is used to prevent the carrier (4) and the plastic film (8) from falling out of the carrier slot (3) after being abutted against the plastic film (8).
5. A diode braiding device according to claim 1, characterized in that: The operating box (5) is fixedly provided with a limit block (20) located above the first positioning block (9); a positioning rod (21) is rotatably provided on the limit block (20) and is opposite to and parallel to the limit rod (10) in the upper and lower directions; two third positioning blocks (22) are slidably sleeved on the positioning rod (21); and a second bolt (23) is threadedly passed through each of the third positioning blocks (22) and abutted against the positioning rod (21).
6. A diode braiding device according to claim 1, characterized in that: Two opposing limiting plates (24) are fixedly arranged on the feeding platform (2), and the two limiting plates (24) are arranged oppositely on two sides of the carrier slot (3), and a protective edging (25) is provided on the side wall of each limiting plate (24) away from the carrier slot (3).
7. A diode braiding device according to claim 6, characterized in that: A positioning member (26) is fixedly provided on the workbench (1), and a second discharge roller (27) parallel to the first discharge roller (6) is rotatably provided on the positioning member (26), and a second winding wheel (28) is fixedly provided on the second discharge roller (27), and the carrier tape (4) is wound on the second winding wheel (28), and one end of the carrier tape (4) is pulled away from the second winding wheel (28) and slidably provided in the carrier tape slot (3), and the carrier tape (4) slidably provided in the carrier tape slot (3) is in sliding contact with the bottom of the limiting plate (24).
8. A diode braiding device according to claim 7, characterized in that: A positioning box (30) provided with a sliding groove (29) is fixedly provided on the positioning member (26), the opening of the positioning box (30) abuts against one side of the feeding platform (2), and the positioning box (30) is arranged between the second winding wheel (28) and the limiting plate (24), and a flattening rod (31) is vertically slidably provided in the sliding groove (29), and the positioning box (30) has a row of vertically distributed threaded holes opposite to the limiting plate (24), and also includes a third bolt (32), and the third bolt (32) is passed through any threaded hole and abuts against the flattening rod (31).