Special-shaped side-entry backlight source

Abstract

The utility model relates to a special-shaped side-in type backlight source which comprises a die casting, a reflecting film, a light guide plate, a light bar and a plurality of dotted adhesives. A groove is formed in the die casting, and the light bar is arranged on the side wall of the groove; the reflecting film is provided with four side edges, one side edge of the reflecting film is a light incident side, the other three side edges of the reflecting film are light reflecting sides, each light reflecting side is bent to form a folded edge part, the reflecting film is arranged in the groove, and the folded edge parts of the reflecting film abut against the side wall of the groove; the dot-shaped glue is arranged on the light incident side of the reflecting film at equal intervals, a plurality of lamp beads are arranged on the lamp strip, and each lamp bead is aligned to a gap between every two adjacent dot-shaped glue; the side wall of the light guide plate is provided with a first limiting boss in a protruding mode, the light guide plate is arranged on the reflecting film, the first limiting boss of the light guide plate abuts against the light bar, the light guide plate is bonded to the reflecting film through the dotted glue, and the other three side walls of the light guide plate abut against the three edge folding parts of the reflecting film respectively. By means of the arrangement, the light emitting effect of the special-shaped side-in type backlight source can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of backlights, and particularly relates to a special-shaped side-entry backlight. Background Art

[0002] A backlight is a light source located behind a liquid crystal display, and its light-emitting effect will directly affect the visual effect of the liquid crystal display module. The liquid crystal display itself does not emit light, but only displays graphics or modulates light, so a backlight is needed to provide light for the liquid crystal display.

[0003] In the existing special-shaped side-entry backlight, at the connection between the light guide plate and the lamp strip, the heat generated by the lamp beads on the lamp strip during light emission is likely to affect the sawteeth of the light guide plate, resulting in melting deformation or yellowing of the sawteeth of the light guide plate, and further affecting the light-emitting display effect of the backlight. At the same time, in front of the lamp strip, if the light guide plate is not fixed on the reflective film, it will cause uneven brightness and darkness at the position of the backlight close to the lamp strip. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a special-shaped side-entry backlight.

[0005] The technical solution for the utility model to solve the above technical problems is as follows: A special-shaped side-entry backlight, comprising: a die-casting part, a reflective film, a light guide plate, a lamp strip and a plurality of dot adhesives; a groove is formed on the die-casting part, and the lamp strip is arranged on the side wall of the groove; the reflective film has four side edges, one side edge of the reflective film is the light-incident side, and the other three side edges of the reflective film are the light-reflective sides, and a folded edge part is bent out from each light-reflective side, the reflective film is arranged in the groove, and the folded edge part of the reflective film abuts against the side wall of the groove; the dot adhesives are arranged at equal intervals on the light-incident side of the reflective film, the lamp strip has a plurality of lamp beads, and the gap between each lamp bead and the adjacent two dot adhesives is aligned; a first limiting boss is convexly arranged on the side wall of the light guide plate, the light guide plate is arranged on the reflective film, the first limiting boss of the light guide plate abuts against the lamp strip, and the dot adhesives bond the light guide plate to the reflective film, and the other three side walls of the light guide plate respectively abut against the three folded edge parts of the reflective film.

[0006] In one embodiment, a first fixing adhesive is arranged on the die-casting part near the light-incident side of the reflective film, one side of the first fixing adhesive is bonded to the die-casting part, and the other side of the first fixing adhesive is bonded to the reflective film.

[0007] In one embodiment, silicone limiting grooves are respectively formed at two corners in the groove of the die-cast part. The two silicone limiting grooves are formed on the light incident side away from the reflective film. Silicone blocks are arranged in the two silicone limiting grooves. The reflective film is arranged on the two silicone blocks. The folded edge part of the reflective film abuts against both sides of the silicone blocks. The two corners of the light guide plate respectively abut against the two silicone blocks.

[0008] In one embodiment, the special-shaped side-in type backlight source further includes a plurality of optical films. A second limiting boss is convexly arranged on the surface of the light guide plate facing away from the reflective film. Ear clamping grooves are respectively formed on each of the optical films. The optical films are stacked on the light guide plate. The ear clamping grooves of the optical films are aligned and communicated. The second limiting boss on the light guide plate is located in the ear clamping grooves of the optical films.

[0009] In one embodiment, the special-shaped side-in type backlight source further includes a plurality of second fixing adhesives. One second fixing adhesive is arranged between the light guide plate and one optical film, and the other second fixing adhesives are arranged between two adjacent optical films.

[0010] In one embodiment, the special-shaped side-in type backlight source further includes a middle iron frame. A limiting hole is formed in the middle iron frame. The middle iron frame is covered and arranged on the die-cast part. The second limiting boss on the light guide plate is located in the limiting hole.

[0011] In one embodiment, a positioning convex block is convexly arranged on the side wall of the middle iron frame. A positioning clamping groove is formed in the die-cast part. When the middle iron frame is arranged on the die-cast part, the positioning convex block is inserted into the positioning clamping groove.

[0012] In one embodiment, a T-shaped clamping block is convexly arranged on the side wall of the middle iron frame. A T-shaped clamping groove is formed in the die-cast part. When the middle iron frame is arranged on the die-cast part, the T-shaped clamping block is clamped and arranged in the T-shaped clamping groove.

[0013] In one embodiment, a third fixing adhesive is arranged between the middle iron frame and the die-cast part. One side of the third fixing adhesive is bonded to the die-cast part, and the other side of the third fixing adhesive is bonded to the middle iron frame.

[0014] In one embodiment, a connecting block is convexly arranged on one side wall of the middle iron frame. The connecting block is perpendicular to the middle iron frame. A clamping hole is formed in the connecting block. A clamping block is convexly arranged on the side of the die-cast part. When the middle iron frame is arranged on the die-cast part, the clamping block is arranged in the clamping hole.

[0015] The beneficial effects of the present utility model are as follows: An irregular side-entry backlight provided by the present utility model has a first limiting boss protruding on the side wall of the light guide plate, such that the first limiting boss abuts against the light bar. At this time, there is a certain gap between the side wall of the light guide plate and the light bar. That is, a safety distance is ensured between the sawteeth on the light guide plate and the lamp beads on the light bar, thereby avoiding the heat generated by the lamp beads from affecting the sawteeth of the light guide plate when the irregular side-entry backlight is working, and ensuring a good light-emitting effect of the irregular side-entry backlight. A number of dot-shaped adhesives are equidistantly spaced on the light-incident side of the reflective film, and the gaps between each lamp bead and the adjacent two dot-shaped adhesives are aligned. In this way, the light guide plate and the emission film can be bonded and fixed into a whole, that is, the light guide plate is fixedly arranged on the reflective film in front of the light bar, thereby avoiding the shaking of the light guide plate, and further improving the light-emitting effect of the irregular side-entry backlight at the light bar and avoiding the optical phenomenon of uneven brightness and darkness of the irregular side-entry backlight in front of the lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0017] Figure 1 Schematic diagram of the three-dimensional structure of an irregular side-entry backlight in one direction for an embodiment;

[0018] Figure 2 Schematic diagram of the three-dimensional structure of a die-casting part, a reflective film, and a light guide plate in one direction for an embodiment;

[0019] Figure 3 For Figure 2 Partial enlarged structural diagram of part A in

[0020] Figure 4 Schematic diagram of the three-dimensional structure of a die-casting part, a reflective film, and a light guide plate in another direction for an embodiment;

[0021] Figure 5 For Figure 4 Partial enlarged structural diagram of part B in

[0022] Figure 6 Schematic diagram of the three-dimensional structure of a die-casting part, a reflective film, a light guide plate, an optical film, and an iron middle frame in one direction for an embodiment;

[0023] Figure 7 For Figure 6 Partial enlarged structural diagram of part C in

[0024] Figure 8 Schematic three-dimensional structure diagram of a die-cast part, a middle iron frame and a single-sided foam adhesive in one direction for an embodiment;

[0025] Figure 9 For Figure 8 Partial enlarged structure diagram of part D in

[0026] Figure 10 For Figure 8 Partial enlarged structure diagram of part E in

[0027] In the attached drawings, 10, special-shaped side-entry backlight; 100, die-cast part; 110, groove; 120, silicone limit groove; 130, positioning card slot; 140, T-buckle groove; 150, clamping block; 200, reflective film; 210, light-incident side; 220, folded edge part; 230, first fixing glue; 300, light guide plate; 310, first limit boss; 320, second limit boss; 400, lamp strip; 410, lamp bead; 500, dot glue; 600, silicone block; 700, optical film; 710, ear slot; 720, second fixing glue; 800, middle iron frame; 810, positioning boss; 820, T-shaped buckle block; 830, third fixing glue; 840, connecting block; 841, clamping hole; 850, limit hole; 900, single-sided foam adhesive. Detailed implementation manners

[0028] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The following will further describe the technical solutions of the present invention with reference to the drawings of the embodiments of the present invention. The present invention is not limited to the following specific implementation manners.

[0029] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. It is 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. Therefore, the terms describing the position relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] In one embodiment, as Figures 1 to 5As shown in the figure, a special-shaped side-entry backlight 10 includes: a die-cast part 100, a reflective film 200, a light guide plate 300, a lamp strip 400, and several dot adhesives 500; a groove 110 is formed on the die-cast part 100, and the lamp strip 400 is arranged on the side wall of the groove 110; the reflective film 200 has four side edges, one side edge of the reflective film 200 is the light incident side 210, and the other three side edges of the reflective film 200 are reflective sides, and a folded edge part 220 is bent out on each reflective side. The reflective film 200 is arranged in the groove 110, and the folded edge part 220 of the reflective film 200 abuts against the side wall of the groove 110; each of the dot adhesives 500 is arranged at equal intervals on the light incident side 210 of the reflective film 200, and there are several lamp beads 410 on the lamp strip 400, and each lamp bead 410 is aligned with the gap between two adjacent dot adhesives 500; a first limiting boss 310 is convexly arranged on the side wall of the light guide plate 300, the light guide plate 300 is arranged on the reflective film 200, the first limiting boss 310 of the light guide plate 300 abuts against the lamp strip 400, and each dot adhesive 500 bonds the light guide plate 300 to the reflective film 200, and the other three side walls of the light guide plate 300 respectively abut against the three folded edge parts 220 of the reflective film 200.

[0031] Specifically, by convexly arranging the first limiting boss 310 on the side wall of the light guide plate 300, the first limiting boss 310 abuts against the lamp strip 400. At this time, there is a certain gap between the side wall of the light guide plate 300 and the lamp strip 400. That is, it ensures that there is a safe distance between the sawteeth on the light guide plate 300 and the lamp beads 410 on the lamp strip 400, so as to avoid the heat generated by the lamp beads 410 affecting the sawteeth of the light guide plate 300 when the special-shaped side-entry backlight 10 is working, and ensure that the special-shaped side-entry backlight 10 has a good light-emitting effect. By arranging several dot adhesives 500 at equal intervals on the light incident side 210 of the reflective film 200, and each lamp bead 410 is aligned with the gap between two adjacent dot adhesives 500, the light guide plate 300 and the emission film can be bonded and fixed into a whole, that is, before the lamp strip 400, the light guide plate 300 is fixedly arranged on the reflective film 200, so as to avoid the light guide plate 300 from shaking, and further improve the light-emitting effect of the special-shaped side-entry backlight 10 at the lamp strip 400, and avoid the optical phenomenon of uneven brightness and darkness of the special-shaped side-entry backlight 10 in front of the lamp.

[0032] In this embodiment, the light bar 400 abuts against the first limiting boss 310 of the light guide plate 300. After the lamp beads 410 on the light bar 400 emit light, the light is diffused through the light guide plate 300 to the entire special-shaped side-entry backlight 10, so as to realize the normal light-emitting operation of the special-shaped side-entry backlight 10.

[0033] In order to firmly fix the reflective film 200 and the light guide plate 300 in the groove 110 of the die-casting part 100, in one embodiment, as Figure 4 and Figure 5 shown, the die-casting part 100 is provided with a first fixing glue 230 at the light incident side 210 close to the reflective film 200. One side of the first fixing glue 230 is bonded to the die-casting part 100, and the other side of the first fixing glue 230 is bonded to the reflective film 200. Specifically, by setting the first fixing glue 230, the whole formed by fixing the reflective film 200 and the light guide plate 300 can be adhesively fixed in the groove 110 on the die-casting part 100, so as to realize the limiting and fixing of the reflective film 200 and the light guide plate 300.

[0034] In order to limit and fix the light guide plate 300 in the groove 110, in one embodiment, as Figure 2 、 Figure 4 and Figure 5 shown, two corner positions in the groove 110 of the die-casting part 100 are respectively provided with silica gel limiting grooves 120. The two silica gel limiting grooves 120 are opened on the side away from the light incident side 210 of the reflective film 200. Silica gel blocks 600 are arranged in the two silica gel limiting grooves 120. The reflective film 200 is arranged on the two silica gel blocks 600. The folded edge part 220 of the reflective film 200 abuts against both sides of the silica gel block 600. The two corner positions of the light guide plate 300 respectively abut against the two silica gel blocks 600. Specifically, the part of the light guide plate 300 away from the light bar 400 is the tail of the light guide plate 300. The silica gel blocks 600 are adhesively fixed in the silica gel limiting grooves 120 of the die-casting part 100 through double-sided adhesive tapes. The silica gel blocks 600 are arranged in an interference fit with the tail of the light guide plate 300 by adopting an interference design, so as to realize the limiting and fixing of the light guide plate 300 and avoid the light guide plate 300 from loosening and generating abnormal noises; in addition, the interference design of the silica gel blocks 600 can also ensure that the light guide plate 300 will not have adverse phenomena such as expansion, contraction and arching under the environmental changes of temperature change, frequency conversion vibration and humidity change.

[0035] In order to fixedly arrange each optical film 700 on the special-shaped side-entry backlight 10, in one embodiment, as Figure 6 and Figure 7As shown, the irregular side-in type backlight 10 further includes a plurality of optical films 700. A second limiting boss 320 is protrudingly provided on a surface of the light guide plate 300 facing away from the reflection film 200. Ear slots 710 are respectively formed on each of the optical films 700. The optical films 700 are stacked on the light guide plate 300. The ear slots 710 of each of the optical films 700 are aligned and communicated. The second limiting boss 320 on the light guide plate 300 is located in the ear slots 710 of each of the optical films 700. Specifically, three second limiting bosses 320 are protrudingly provided on the light guide plate 300, and three ear slots 710 are respectively formed on each of the optical films 700. Each second limiting boss 320 is correspondingly arranged with an ear slot 710. By nesting the ear slots 710 on each of the optical films 700 on the second limiting bosses 320 on the light guide plate 300, the limiting and fixing of each of the optical films 700 can be realized, thereby avoiding the displacement of each of the optical films 700.

[0036] In order to stably connect between each of the optical films 700 and between the optical film 700 and the light guide plate 300, in one embodiment, as Figure 6 and Figure 7 shown, the irregular side-in type backlight 10 further includes a plurality of second fixing adhesives 720. One second fixing adhesive 720 is arranged between the light guide plate 300 and one optical film 700, and the other second fixing adhesives 720 are arranged between two adjacent optical films 700. Specifically, by arranging the second fixing adhesives 720 between two adjacent optical films 700 and between the optical film 700 and the light guide plate 300, the second fixing adhesives 720 can bond and fix each of the optical films 700 together, and finally bond the optical films 700 together and fix them on the light guide plate 300 through the second fixing adhesives 720, thereby realizing the limiting and fixing of each of the optical films 700 and avoiding the loosening of each of the optical films 700.

[0037] In order to avoid the phenomenon that each of the optical films 700 jumps off and displaces, in one embodiment, as Figure 7 、 Figure 8 and Figure 9As shown, the special-shaped side-entry backlight 10 further includes a middle iron frame 800. A limiting hole 850 is formed in the middle iron frame 800. The middle iron frame 800 is covered and arranged on the die-casting part 100. The second limiting boss 320 on the light guide plate 300 is located in the limiting hole 850. Specifically, by covering the middle iron frame 800 on the die-casting part 100 and inserting the second limiting boss 320 on the light guide plate 300 into the limiting hole 850 on the middle iron frame 800, the middle iron frame 800 can be used to press and fix each optical film 700, thereby avoiding the phenomenon of the optical films 700 jumping off and shifting.

[0038] In order to position and fix the middle iron frame 800 on the die-casting part 100, in one embodiment, as Figure 8 , Figure 9 and Figure 10 shown, a positioning convex block 810 is protrudingly arranged on the side wall of the middle iron frame 800. A positioning clamping groove 130 is formed in the die-casting part 100. When the middle iron frame 800 is arranged on the die-casting part 100, the positioning convex block 810 is inserted into the positioning clamping groove 130. Specifically, the positioning convex block 810 is arranged on the outer side walls around the middle iron frame 800. When the middle iron frame 800 is covered and arranged on the die-casting part 100, the positioning convex block 810 is inserted into the positioning clamping groove 130, thereby playing a role in limiting and fixing the middle iron frame 800 and preventing the middle iron frame 800 with a thinner and softer structure from having adverse phenomena such as outward deflection, which may affect the optical effect and reliable performance of the special-shaped side-entry backlight 10.

[0039] In order to further firmly cover and arrange the middle iron frame 800 on the die-casting part 100, in one embodiment, as Figure 8 , Figure 9 and Figure 10 shown, a T-shaped clamping block 820 is protrudingly arranged on the side wall of the middle iron frame 800. A T-shaped clamping groove 140 is formed in the die-casting part 100. When the middle iron frame 800 is arranged on the die-casting part 100, the T-shaped clamping block 820 is clamped and arranged in the T-shaped clamping groove 140. Specifically, the cross-sectional shape of the T-shaped clamping block 820 is in the shape of a "T". When the middle iron frame 800 is covered and arranged on the die-casting part 100, the T-shaped clamping block 820 is inserted into the T-shaped clamping groove 140, thereby playing a role in limiting and fixing the middle iron frame 800 and avoiding adverse phenomena such as outward deflection, warping, and loosening of the middle iron frame 800.

[0040] In order to avoid the middle iron frame 800 from loosening on the die-casting part 100, in one embodiment, as Figure 8As shown, a third fixing glue 830 is provided between the middle iron frame 800 and the die-cast part 100. One side of the third fixing glue 830 is adhered to the die-cast part 100, and the other side of the third fixing glue 830 is adhered to the middle iron frame 800. Specifically, by providing the third fixing glue 830 between the middle iron frame 800 and the die-cast part 100, the third fixing glue 830 is used to adhesively fix the middle iron frame 800 within the die-cast part 100, thereby preventing the middle iron frame 800 from loosening.

[0041] To further fix the middle iron frame 800 on the die-cast part 100, in one embodiment, as Figure 8 shown, a connecting block 840 protrudes from one side wall of the middle iron frame 800. The connecting block 840 is perpendicular to the middle iron frame 800, and a clamping hole 841 is formed in the connecting block 840. A clamping block 150 protrudes from the side of the die-cast part 100. When the middle iron frame 800 is disposed on the die-cast part 100, the clamping block 150 is disposed within the clamping hole 841. Specifically, when the middle iron frame 800 is disposed on the die-cast part 100, the connecting block 840 is connected to the outer side wall of the die-cast part 100. At this time, the clamping block 150 on the die-cast part 100 will be inserted into the clamping hole 841, thereby fixing the middle iron frame 800 on the die-cast part 100 and preventing the middle iron frame 800 from protruding outwards.

[0042] In one embodiment, as Figure 8 shown, a foam single-sided adhesive 900 is provided on the side of the middle iron frame 800 facing away from the die-cast part 100. Specifically, the foam single-sided adhesive 900 can provide a buffering and protecting effect for the special-shaped side-entry backlight 10.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. An irregular side-entry backlight, characterized in that, Comprising: A die-casting part, a reflective film, a light guide plate, a light bar and a plurality of dot adhesives; A groove is formed in the die-casting part, and the light bar is arranged on the side wall of the groove; The reflective film has four side edges. One side edge of the reflective film is the light incident side, and the other three side edges of the reflective film are reflective sides. Each reflective side is bent to form a folded edge portion. The reflective film is arranged in the groove, and the folded edge portion of the reflective film abuts against the side wall of the groove; The dot adhesives are arranged at equal intervals on the light incident side of the reflective film. The light bar has a plurality of lamp beads, and each lamp bead is aligned with the gap between two adjacent dot adhesives; A first limiting boss is convexly arranged on the side wall of the light guide plate. The light guide plate is arranged on the reflective film. The first limiting boss of the light guide plate abuts against the light bar, and each dot adhesive bonds the light guide plate to the reflective film. The other three side walls of the light guide plate respectively abut against the three folded edge portions of the reflective film.

2. The special-shaped side-entry backlight according to claim 1, wherein A first fixing adhesive is arranged on the die-casting part near the light incident side of the reflective film. One side of the first fixing adhesive is bonded to the die-casting part, and the other side of the first fixing adhesive is bonded to the reflective film.

3. The special-shaped side-entry backlight according to claim 1, wherein, Silicone limiting grooves are respectively formed at two corners in the groove of the die-casting part. The two silicone limiting grooves are formed on the side far from the light incident side of the reflective film. Silicone blocks are arranged in the two silicone limiting grooves. The reflective film is arranged on the two silicone blocks. The folded edge portion of the reflective film abuts against both sides of the silicone block. The two corners of the light guide plate respectively abut against the two silicone blocks.

4. The special-shaped side-entry backlight according to claim 1, wherein It further comprises a plurality of optical film sheets. A second limiting boss is convexly arranged on the surface of the light guide plate facing away from the reflective film. Ear-catching grooves are respectively formed on each optical film sheet. The optical film sheets are stacked on the light guide plate. The ear-catching grooves of the optical film sheets are aligned and communicated. The second limiting boss on the light guide plate is located in the ear-catching grooves of the optical film sheets.

5. The special-shaped side-entry backlight according to claim 4, wherein It further comprises a plurality of second fixing adhesives. One second fixing adhesive is arranged between the light guide plate and one optical film sheet, and the other second fixing adhesives are arranged between two adjacent optical film sheets.

6. The special-shaped side-entry backlight according to claim 4, wherein, It further comprises a middle iron frame. A limiting hole is formed in the middle iron frame. The middle iron frame is covered and arranged on the die-casting part. The second limiting boss on the light guide plate is located in the limiting hole.

7. The special-shaped side-entry backlight according to claim 6, wherein A positioning convex block is convexly arranged on the side wall of the middle iron frame. A positioning card slot is formed in the die-casting part. When the middle iron frame is arranged on the die-casting part, the positioning convex block is inserted into the positioning card slot.

8. The special-shaped side-entry backlight according to claim 6, wherein, A T-shaped buckle block is convexly arranged on the side wall of the middle iron frame. A T-shaped buckle groove is formed in the die-casting part. When the middle iron frame is arranged on the die-casting part, the T-shaped buckle block is clamped and arranged in the T-shaped buckle groove.

9. The special-shaped side-entry backlight according to claim 6, wherein, A third fixing adhesive is arranged between the middle iron frame and the die-casting part. One side of the third fixing adhesive is bonded to the die-casting part, and the other side of the third fixing adhesive is bonded to the middle iron frame.

10. A special-shaped side-entry backlight according to claim 6, characterized in that One side wall of the middle iron frame is provided with a connecting block protruding therefrom. The connecting block is perpendicular to the middle iron frame, and a clamping hole is formed in the connecting block. A clamping block is provided protruding from the side of the die casting. When the middle iron frame is arranged on the die casting, the clamping block is arranged in the clamping hole.

Images